Methods of treating cancer using bifunctional molecules that target growth factors

ABSTRACT

This description provides novel strategies and methods for treatment of hyperproliferation conditions such as keloids, lung fibrosis, and lung cancer with the use of bi-functional molecules that target growth factors. A bifunctional hepatoma-derived growth factor (HDGF)-specific antibody for these methods comprises at least one complementarity determining region (CDR) specific for HDGF, at least one receptor domain that specifically binds to a growth factor selected from vascular endothelial growth factor (VEGF) and transforming growth factor beta (TGFβ).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 371 national stage application of PCT ApplicationNo. PCT/US2017/046934, filed Aug. 15, 2017, and claims benefit ofProvisional Appln. 62/375,894, filed Aug. 16, 2016, the entire contentsof each of which are hereby incorporated by reference as if fully setforth herein, under 35 U.S.C. § 119(e).

REFERENCE TO SEQUENCE LISTING SUBMITTED VIA EFS-WEB

This application includes an electronically submitted sequence listingin .txt format. The .txt file contains a sequence listing entitled“2021-06-15_15024-342US1_ST25.txt” created on Jun. 15, 2021 and is60,512 bytes in size. The sequence listing contained in this .txt fileis part of the specification and is hereby incorporated by referenceherein in its entirety.

BACKGROUND

Lung diseases including lung cancer and pulmonary fibrosis (PF) are aleading cause of death worldwide. PF is one of a family of relateddiseases called interstitial lung diseases that can result in lungscarring. As the lung tissue becomes scarred, it interferes with aperson's ability to breathe. Hyperproliferation of cells (e.g.,fibroblasts or cancer cells) can cause various types of medicalconditions (i.e., hyperproliferative conditions) such as keloids,idiopathic pulmonary fibrosis, and lung cancer. Keloids are a type ofabnormally formed scar which is composed mainly of collagen as a resultof an overgrowth of fibroblasts during wound healing. While keloid scarsare benign and not contagious, it may be accompanied by severeitchiness, pain, and changes in skin texture. On the other hand,interstitial lung diseases, particularly idiopathic pulmonary fibrosis,are life threatening and have no cure currently.

Hepatoma-derived growth factor (HDGF) is a heparin-binding growth factoridentified from media conditioned by a human hepatoma-derived cell line.It produces mitogenic activity in various cells types. Normally, HDGF ishighly expressed during embryonic development in smooth muscle, gut, andendothelium, but not after birth. It has also been implicated inangiogenesis. High-level HDGF is observed in various human cancers.Specifically, HDGF is overexpressed in lung cancer and is a novelmitogenic growth factor for fibroblasts, vascular endothelial cells, andsmooth muscle cells. High HDGF expression can also be found in keloidscar tissues but not in normal scar tissue. The molecular mechanisms ofHDGF in cancer progression are poorly understood but we havedemonstrated that lung cancer cells with down-regulated HDGF formedsignificantly smaller tumors in vivo (Zhang J., et al., “Down-regulationof hepatoma-derived growth factor inhibits anchorage-independent growthand invasion of non-small cell lung cancer cells,” Cancer Res 2006; 66:18-23). Diseases of the lung remain difficult to treat effectively.Therefore, a novel strategy to prevent and treat diseases due toabnormal proliferation of cells (i.e., fibroblasts, cancer cells) isneeded.

SUMMARY OF THE INVENTION

It has been discovered that it is possible to treat a hyperproliferativecondition (e.g., keloids, interstitial lung disease, lung cancer) with asingle bi-functional chimeric antibody which simultaneously targets HDGFand other over-produced angiogenic factors (i.e., VEGF and TGF-β) intissue that is damaged, scarred, or cancerous. The simultaneoustargeting of these growth factors using a single molecule allows foreasier administration and improved efficacy.

Embodiments of the invention include a bifunctional hepatoma-derivedgrowth factor (HDGF)-specific antibody (e.g., H3K, hH3K, H3T and hH3T)comprising at least one complementarity determining region (CDR)specific for HDGF and at least one receptor domain that alsospecifically binds to a growth factor selected from vascular endothelialgrowth factor (VEGF) and transforming growth factor beta (TGFβ). The CDRmay be selected from a mouse, human, rabbit, rat or other mammalian CDR,preferably a mouse CDR. The antibody may be humanized or chimeric andcomprises two receptor domains each of which independently binds to agrowth factor selected from vascular endothelial growth factor (VEGF)and transforming growth factor beta (TGFβ) (i.e., a TGFβ selected fromTGFβ subtype 1, subtype 2, and subtype 3). In certain aspects of theinvention, the bifunctional hepatoma-derived growth factor(HDGF)-specific antibody is linked to a reporter molecule selected fromthe group consisting of an enzyme, a radiolabel, a hapten, a fluorescentlabel, a phosphorescent molecule, a chemiluminescent molecule, achromophore, a luminescent molecule, a photoaffinity molecule, a ligand,a colored particle or biotin. In the alternative, the antibody is linkedto an effector molecule selected from the group consisting of, a toxin,and an apoptotis-inducing molecule, an antitumor agent, a therapeuticenzyme or a cytokine. In some aspects, the antitumor agent is selectedfrom the group consisting of gemcitabine, pemetrexed, cisplatin,docetaxel, vinorelbine, doxorubicin, 6-fluorouracil, erlotinib,gefitinib, and crizotinib.

In some embodiments, pharmaceutical compositions comprising thebifunctional hepatoma-derived growth factor (HDGF)-specific antibodywith a pharmaceutically acceptable carrier and kits comprising them areprovided. The pharmaceutical composition can be formulated forparenteral, intravenous or topical administration. Preferably thepharmaceutical composition is formulated for administration in an amountfrom 5 to 25 mg/kg every 1-3 weeks.

Further embodiments include methods of reducing the growth ofhyperproliferative cells in a subject by administering to the subjectthe bifunctional hepatoma-derived growth factor (HDGF)-specific antibodyin an amount of that down regulates HDGF and VEGF expression or HDGF andTGFβ expression and is effective to reduce the abnormal growth of thehyperproliferative cells. In some embodiments, the hyperproliferativecell may be a fibroblast or a cancer cell. The cancer cell can beselected from the group consisting of lung, pancreas, colon, ovarian,liver, glioblastoma, and squamous cell carcinoma.

In other embodiments, methods are provided for simultaneously reducingexpression of HDGF and VEGF or HDGF and TGFβ in a subject in needthereof by administering a bifunctional HDGF-specific antibody or acombination of the bifunctional HDGF-specific antibodies (e.g., hH3K andhH3T). The bifunctional antibody can also be incorporated into a device,which may allow controlled release of the antibody to a needed site. Insome embodiments, the device may be a scaffold, porous material,micro-encapsulating material or an infusion device (e.g., a coronarystent, or a wound dressing). The subject in need suffers from ahyperproliferative condition selected from the group consisting ofinterstitial lung disease, keloids, lung fibrosis, idiopathic pulmonaryfibrosis, lung cancer, pancreatic cancer, colon cancer, ovarian cancer,liver cancer, glioblastoma, and squamous cell carcinoma.

BRIEF DESCRIPTION OF THE DRAWINGS

The following drawings form part of the present specification and areincluded to further demonstrate certain embodiments of the presentinvention. The invention may be better understood by reference to one ormore of these drawings in combination with the detailed description ofspecific embodiments presented herein.

FIG. 1 is a schematic diagram illustrating a bi-functional chimericantibody-based targeting protein (hc-H3-V-T-traps) specific embodimentsof which are referred to as H3K or H3T.

FIG. 2A and FIG. 2B are images of western blots illustratingimmunoprecipitation data for hc-anti HDGF H3 and hc-H3-V/T-traps.

FIG. 3 is a graph illustrating growth curves of PDX model 2131-8receiving different treatments and showing that anti-HDGF antibodyinhibits tumor drug resistance. Human Patient Derived tumor Xenograph(PDX) model 2131-8, a poorly differentiated adenocarcinoma of the lung,was implanted on the flank of athymic nude mice. Established tumors(150-400 mm³, 10 tumors per group) were treated with chemotherapy orcombined chemotherapy plus antibody regimen. Arm A (top curve): PBS; ArmB (third top curve): Gemcitabine, 1.2 mg/kg; Arm C (bottom curve):Gemcitabine 1.2 mg/kg plus anti-HDGF H3 at 12.5 mg/kg; Arm D (second topcurve): Gemcitabine 1.2 mg/kg plus anti-HDGF H3/VEGF trapper (H3K) at12.5 mg/kg. The drugs were given intraperitonally every 3 days untiltumor regression or sacrifice due to excess tumor burden.

FIG. 4A and FIG. 4B are two graphs illustrating bifunctionalantibody-induced extended tumor (volume) remission and plots eachindividual tumor volume in the ten individuals treated in arm C (FIG.4A) and arm D (FIG. 4B). Treatments were terminated after complete tumorremission in animals receiving Gemzar plus antibody; each curverepresents one animal. Arm C: Gemzar plus anti-HDFG H3 treated; Arm D:Gemzar plus anti-HDGF/VEGF trapper (H3K) treated.

FIG. 5 is a graph illustrating results after treatment with bleomycin(36 ug/animal) given intratracheally to C57/B6 mice (5-6 weeks old, 7per group) under anesthesia. Antibodies were given twenty-four hourslater intraperitonally in the following treatment groups: (1) control(PBS, diamonds); (2) mouse anti-HDGF H3 plus anti-HDGF C1 125 ug each(H3+C1, squares); and (3) anti-HDGF H3 250 ug plus Avastin 100 μg (H3+A,triangles). The treatments were given every 3 days thereafter for atotal 6 doses, and animals were monitored daily.

FIG. 6 is a graph illustrating results from mice (5-6 weeks old, 7 pergroup) primed with antibody intraperitoneally according to the followingtreatment groups: (1) control (PBS, diamonds); (2) anti-HDGF H3 plusanti-HDGF C1 125 ug each (H3+C1, squares); (3) chimeric anti-HDGFH3/VEGF trapper plus anti-HDGF C1, 125 ug each (H3K+C1, triangles); and(4) chimeric anti-HDGF H3/TGFB trapper plus anti-HDGF C1, 125 ug each(h3T+C1, x). Bleomycin (36 ug/animal) was given intratracheally 24-hourslater under anesthesia. Antibodies were again given on day 3 (24-hrpost-bleomycin instillation), and every three days thereafter for atotal of 7 doses (including priming) Animals were monitored daily.

FIG. 7A and FIG. 7B are images of high-level, sustained HDGF expressionresults after bleomycin treatment. FIG. 7A: Reorganization of native andpost-transcriptionally modified HDGF by various anti-HDGF antibodies inA549 lung cancer cell protein extract on Western blot. FIG. 7B:Anti-HDGF antibody staining of protein extracts from Bleomycin treatedlung. Bleomycin or PBS was given intratracheally to the lung of C57mice. Lung tissue was dissected 24 or 48 hours post treatment, andhomogenized in lysis buffer with proteinase inhibitors and 1% TritonX-100. Supernatants were separated by SDS gel, blotted on nitrocellulosemembrane and stained with anti-HDGF antibodies. Lanes marked 1 indicatePBS-treated lung; lanes marked 2 indicate 24 hours post bleomycintreatment; lanes marked 3 indicate 48 hours post bleomycin treatment.

FIG. 8A, FIG. 8B, FIG. 8C, and FIG. 8D are images of anti-HDGF antibodyinhibiting fibrosis in bleomycin damaged lung tissue. Mice wereinstilled with bleomycin intratracheally; anti-HDGF H3 plus C1 weregiven 24 hours later. Mice then were sacrificed after one week. Lungwere dissected, fixed in 4% formalin, embedded in paraffin, then 4 umsections were cut. The tissue sections were stained with hematoxylin andeosin. FIG. 8A: normal lung; FIG. 8B: Bleomycin only; FIG. 8C: Bleomycinplus PBS sham treatment; and FIG. 8D: Bleomycin plus anti-HDGFtreatment.

FIG. 9 is a schematic diagram of a vector for recombinant antibodyexpression in mammalian cells (expression cassette of pLVBHN).

FIG. 10A and FIG. 10B are illustrations of immunoprecipitation of HDGFby humanized H3K. Humanized H3 was incubated with lung cancer celllysate to bind HDGF. The immune complex was captured with Protein Gbeads and analyzed by western blotting. The lane marked HH was producedusing humanized heavy chain-V trap and humanized light chains; the lanemarked HM was produced using humanized heavy chain-V trap and chimericlight chain. FIG. 10A shows staining with mouse anti-HDGF H3 antibody.In FIG. 10B, shows blot re-staining with goat-anti-human IgG HRPconjugate.

FIG. 11A, FIG. 11B, and FIG. 11C are a series of three graphs showingthe response of nude mice carrying human NSCLC PDX tumor MDA274 to theindicated anticancer therapies. FIG. 11A shows a summary of fivetreatment regimens. FIG. 11B and FIG. 11C show tumor volumes ofindividual mice. See Example 7.

FIG. 12A, FIG. 12B, and FIG. 12C are a series of three photographsshowing MDA 2131 anti SOX2 immunohistochemical staining of treatmentnaïve tumor (FIG. 12A), tumor treated with Gemzar plus anti-VEGFtreatment (FIG. 12B), and tumor treated with Gemzar plus H3K (FIG. 12C).

FIG. 13A, FIG. 13B, and FIG. 13C are a series of three photographsshowing MDA 2131-8 anti-CD34 immunohistochemical staining of treatmentnaïve tumor (FIG. 13A), tumor treated with Gemzar plus anti-VEGFtreatment (FIG. 13B), and tumor treated with Gemzar plus H3K (FIG. 13C).

FIG. 14A, FIG. 14B, and FIG. 14C are a series of three photographsshowing MDA 2131-8 anti-CD31 immunohistochemical staining of treatmentnaïve tumor (FIG. 14A), tumor treated with Gemzar plus anti-VEGFtreatment (FIG. 14B), and tumor treated with Gemzar plus H3K (FIG. 14C).

FIG. 15A and FIG. 15B are diagrams showing exemplary VEGF trappermolecules.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 1. Introduction

A panel of anti-HDGF antibodies as shown in Table 1 (C1, C4, H3, cH3,hH3, H3K, hH3K, H3T, hH3T, and L5-9) has been generated in an effort togenerate an antibody-based therapeutic strategy to treathyperproliferative conditions as described herein. Treating abnormalproliferation of fibroblasts that cause keloid scarring or lung fibrosisand treating lung cancer with a novel bi-functional molecule targetinggrowth factors (e.g., H3K, hH3K, H3T, and hH3T) allow for a moreeffective simultaneous targeting of not only HDGF, but one or both oftwo over-produced angiogenic factors (i.e., VEGF and TGFβ).

TABLE 1 Antibodies Targeting Growth Factors as a Strategy in TreatingHyperproliferative Conditions. ANTI- TYPE OF PRODUCTION BODY ANTIBODYTARGET VEHICLE H3 mouse monoclone HDGF hybridoma cell line cH3 chimericHDGF plasmid expression clones hH3 humanized HDGF plasmid expressionclones H3K chimeric HDGF, VEGF-A, plasmid expression bifunctional VEGF-Cclones hH3K humanized HDGF, VEGF-A, plasmid expression bifunctionalVEGF-C clones H3T chimeric HDGF, TGF-beta plasmid expressionbifunctional clones hH3T humanized HDGF, TGF-beta plasmid expressionbifunctional clones C1 mouse monoclone HDGF hybridoma cell line C4 mousemonoclone HDGF hybridoma cell line L5-9 mouse monoclone HDGF hybridomacell line

Therefore, embodiments are directed to a bifunctional hepatoma-derivedgrowth factor (HDGF)-specific antibody comprising at least onecomplementarity determining region (CDR) specific for HDGF and at leastone receptor domain that specifically binds to a growth factor selectedfrom vascular endothelial growth factor (VEGF) or transforming growthfactor beta (TGFβ). In some embodiments, pharmaceutical compositionscomprising the bifunctional hepatoma-derived growth factor(HDGF)-specific antibody with a pharmaceutically acceptable carrier areprovided. Further embodiments include methods reducing the growth ofhyperproliferative cells in a subject by administering to the subjectthe bifunctional hepatoma-derived growth factor (HDGF)-specific antibodyin an amount of that down regulates HDGF and VEGF expression or HDGF andTGFβ expression and is effective to reduce the abnormal growth of thehyperproliferative cells. The antibody and the bifunctional antibody didnot reduce the expression of these factors in the cells that producethem, only to block the binding of these factors to cells that havereceptors for these factors, e.g., fibroblasts, vascular endothelialcells, or cancer cells). Therefore, methods are provided forsimultaneously reducing expression of HDGF and VEGF or HDGF and TGFβ (orboth) in a subject in need thereof by administering bifunctionalhepatoma-derived growth factor (HDGF)-specific antibody. The subject inneed suffers from a hyperproliferative condition selected from the groupconsisting of interstitial lung disease, keloids, lung fibrosis,idiopathic pulmonary fibrosis, lung cancer, pancreatic cancer, coloncancer, ovarian cancer, liver cancer, glioblastoma, diabeticretinopathy, age-related macular degeneration, and squamous cellcarcinoma.

2. Definitions

Unless otherwise defined, all technical and scientific terms used hereinare intended to have the same meaning as commonly understood in the artto which this invention pertains and at the time of its filing. Althoughvarious methods and materials similar or equivalent to those describedherein can be used in the practice or testing of the present invention,suitable methods and materials are described below. However, the skilledshould understand that the methods and materials used and described areexamples and may not be the only ones suitable for use in the invention.Moreover, it should also be understood that as measurements are subjectto inherent variability, any temperature, weight, volume, time interval,pH, salinity, molarity or molality, range, concentration and any othermeasurements, quantities or numerical expressions given herein areintended to be approximate and not exact or critical figures unlessexpressly stated to the contrary. Hence, where appropriate to theinvention and as understood by those of skill in the art, it is properto describe the various aspects of the invention using approximate orrelative terms and terms of degree commonly employed in patentapplications, such as: so dimensioned, about, approximately,substantially, essentially, consisting essentially of, comprising, andeffective amount.

Generally, nomenclature used in connection with, and techniques of, celland tissue culture, molecular biology, immunology, microbiology,genetics, protein, and nucleic acid chemistry and hybridizationdescribed herein are those well-known and commonly used in the art. Themethods and techniques of the present invention are generally performedaccording to conventional methods well known in the art and as describedin various general and more specific references that are cited anddiscussed throughout the present specification unless otherwiseindicated. See, e.g., Sambrook et al. Molecular Cloning: A LaboratoryManual, 2d ed., Cold Spring Harbor Laboratory Press, Cold Spring Harbor,N.Y. (1989); Ausubel et al., Current Protocols in Molecular Biology,Greene Publishing Associates (1992, and Supplements to 2002); Harlow andLan, Antibodies: A Laboratory Manual, Cold Spring Harbor LaboratoryPress, Cold Spring Harbor, N.Y. (1990); Principles of Neural Science,4th ed., Eric R. Kandel, James H. Schwartz, Thomas M. Jessell editors.McGraw-Hill/Appleton & Lange: New York, N. Y. (2000). Unless definedotherwise, all technical and scientific terms used herein have the samemeaning as commonly understood by one of ordinary skill in the art.

The term “antibody” as used herein means an immunoglobulin molecule, afragment of an immunoglobulin molecule, or a derivative or variant ofeither thereof, which has the ability to specifically bind to an antigenunder typical physiological conditions.

The term, “chimeric antibody (cAb)” as used herein, means an antibodywherein the variable region is derived from one species (e.g., derivedfrom rodents) and the constant region is derived from a differentspecies, such as human Chimeric antibodies may be generated by antibodyengineering. “Antibody engineering” is a term used generically fordifferent kinds of modifications of antibodies, and which is awell-known process for the skilled person. In particular, a chimericantibody may be generated by using standard DNA techniques known in theart. Thus, the chimeric may be a genetically or an enzymaticallyengineered recombinant antibody. It is within the knowledge of theskilled person to generate a chimeric antibody, and thus, generation ofthe chimeric antibody according to the present invention may beperformed by other methods than described herein. Chimeric monoclonalantibodies for therapeutic applications are developed to reduce antibodyimmunogenicity. They may for typically contain non-human (e.g., murine)variable regions, which are specific for the antigen of interest, andhuman constant antibody heavy and light chain domains. The terms“variable region” or “variable domains” as used in the context ofchimeric antibodies, refers to a region which comprises the CDRs andframework regions of both the heavy and light chains of theimmunoglobulin. A chimeric antibody made by fusing the antigen bindingregion (variable domains of the heavy and light chains, VH and VL) fromone species like a mouse, with the constant domain (effector region)from another species stich as a rabbit. The chimeric antibodies retainthe original antibody's antigen specificity and affinity.

The term “humanized antibody” as used herein, refers to a geneticallyengineered non-human antibody, which contains human antibody constantdomains and non-human and human variable domains modified to contain ahigh level of sequence homology to human variable domains. This can beachieved by grafting the antibody complementarity-determining regions(CDRs), which together form the antigen binding site, onto a homologoushuman acceptor framework region (FR) In order to fully reconstitute thebinding affinity and specificity of the parental antibody, thesubstitution of framework residues from the parental antibody (i.e., thenon-human antibody) into the human framework regions (back-mutations)may be required. Structural homology modeling may help to identify theamino acid residues in the framework regions that are important for thebinding properties of the antibody. Thus, a humanized antibody maycomprise non-human CDR sequences, primarily human framework regionsoptionally comprising one or more amino acid back-mutations to thenon-human amino acid sequence, and fully human constant regions.Optionally, additional amino acid modifications, which are notnecessarily back-mutations, may be applied to obtain a humanizedantibody with preferred characteristics, such as affinity andbiochemical properties. The humanized or chimeric antibody according toany aspect or embodiment of the present invention may be termed“humanized or chimeric H3 antibody” (e.g., H3K or H3T). The amino acidsequence of an antibody of non-human origin is distinct from antibodiesof human origin, and therefore a non-human antibody is potentiallyimmunogenic when administered to human patients. However, despite thenon-human origin of the antibody, its CDR segments are responsible forthe ability of the antibody to bind to its target antigen andhumanization aims to maintain the specificity and binding affinity ofthe antibody. Thus, humanization of non-human therapeutic antibodies isperformed to minimize its immunogenicity in man while such humanizedantibodies at the same time maintain the specificity and bindingaffinity of the antibody of non-human origin.

The term “immunoglobulin heavy chain”, “heavy chain of animmunoglobulin” or “heavy chain” as used herein is intended to refer toone of the chains of an immunoglobulin. A heavy chain is typicallycomprised of a heavy chain variable region (abbreviated herein as VH)and a heavy chain constant region (abbreviated herein as CH) whichdefines the isotype of the immunoglobulin. The heavy chain constantregion typically is comprised of three domains, CH1, CH2, and CH3. Theheavy chain constant region may further comprise a hinge region. Theterm “immunoglobulin” as used herein is intended to refer to a class ofstructurally related glycoproteins consisting of two pairs ofpolypeptide chains, one pair of light (L) low molecular weight chainsand one pair of heavy (H) chains, all four potentially inter-connectedby disulfide bonds. The structure of immunoglobulins has been wellcharacterized. Within the structure of the immunoglobulin, the two heavychains are inter-connected via disulfide bonds in the so-called “hingeregion.” As in the heavy chains, each light chain typically comprisesseveral regions; a light chain variable region (abbreviated herein asVL) and a light chain constant region (abbreviated herein as CL). Thelight chain constant region typically comprises one domain, CL.Furthermore, the VH and VL regions may be further subdivided intoregions of hypervariability (or hypervariable regions which may behypervariable in sequence and/or form of structurally defined loops),also termed complementarity determining regions (CDRs), interspersedwith regions that are more conserved, termed framework regions (FRs).Each VH and VL typically is composed of three CDRs and four FRs,arranged from amino-terminus to carboxy-terminus in the following order:1-R1, CDR1, FR2, CDR2, FR3, CDR3, FR4. CDR sequences may be determinedby use of methods known in the art.

The term “Fab-antigen binding region” as used herein, refers to a regioncomprising, in the direction from the N- to C-terminal, at least a hingeregion, a VL and VH region, and a CL and CH1 region. It binds toantigens, and is composed of one constant and one variable domain ofeach of the heavy and the light chain.

The term “Fc-effector binding region” as used herein, refers to a regioncomprising, in the direction from the N- to C-terminal, at least a hingeregion, a CH2 region and a CH3 region. An Fc region may further comprisea CH1 region at the N-terminal end of the hinge region.

The term “hinge region” as used herein refers to the hinge region of animmunoglobulin heavy chain. Thus, for example the hinge region of ahuman IgG1 antibody corresponds to amino acids 216-230 according to theEu numbering as set forth in Kabat.

The term “isotype” as used herein, refers to the immunoglobulin class(for instance IgG1, IgG2, IgG3, IgG4, IgD, IgA, IgE, or IgM) or anyallotype thereof, that is encoded by heavy chain constant region genes.Thus, in one embodiment, the antibody comprises a heavy chain of animmunoglobulin of the IgG1 class or any allotype thereof. Further, eachheavy chain isotype can be combined with either a kappa (κ) or lambda(λ) light chain.

The term “hyperproliferative condition” as used herein refers to acondition or disorder or disease due to an abnormal proliferation ofcells (e.g., endothelial cells, pericytes, smooth muscle cells). Inpreferred embodiments, fibroblasts, cancer cells, and vascularendothelia cells are examples of cells.

The term, “subject” as used herein, means an organism that, includingbut not limited to mammals, e.g., humans, dogs, cows, horses, kangaroos,pigs, sheep, goats, cats, mice, rabbits, rats, and transgenic non-humananimals. Synonyms used herein include “patient” and “animal.”

The term, “therapeutically effective amount” as used herein means anamount of a therapeutic agent that achieves an intended therapeuticeffect in a subject, e.g., eliminating or reducing or mitigating theseverity of a disease or condition, or a symptom of the disease orcondition. The full therapeutic effect does not necessarily occur byadministration of one dose and may occur only after administration of aseries of doses. Thus, a therapeutically effective amount may beadministered in one or more administrations.

The term, “treating” as used herein means taking steps to obtainbeneficial or desired results, including clinical results, such as, forexample, mitigating, alleviating or ameliorating one or more symptoms ofa disease; diminishing the extent of disease; delaying or slowingdisease progression; ameliorating and palliating or stabilizing a metric(statistic) of disease. The effect may be prophylactic in terms ofcompletely or partially preventing a conditions or disease or symptomthereof and/or may be therapeutic in terms of a partial or complete curefor a condition or disease and/or adverse effect attributable to thecondition or disease. “Treatment” refers to the steps taken. It caninclude any treatment of a condition or disease in a mammal,particularly in a human, and includes: (a) preventing the condition ordisease or symptom thereof from occurring in a subject which may bepredisposed to the condition or disease but has not yet been diagnosedas having it; (b) inhibiting the condition or disease or symptomthereof, such as, arresting its development; and (c) relieving,alleviating or ameliorating the condition or disease or symptom thereof,such as, for example causing regression of the condition or disease orsymptom thereof by administering a therapeutically effective amount ofthe antibody.

3. Background

A. HDGF

In 1994, investigators described a novel human HDGF in Nakamura, H., etal., “Molecular cloning of complementary DNA for a novel humanhepatoma-derived growth factor: its homology with high mobility group-1protein,” J. Biol. Chem. 269: 25143-25149, 1994. HDGF was purified fromconditioned medium of human hepatoma-derived cell line HuH-7. Molecularcloning of a cDNA from the cDNA library of the same cell line was doneon the basis of the N-terminal amino acid sequence. The cDNA was 2.4 kblong and the deduced amino acid sequence contained 240 amino acidswithout a signal peptide-like N-terminal hydrophobic sequence. Byimmunofluorescence study, investigators showed that HDGF is localized inthe cytoplasm of hepatoma cells. Northern blots illustrated that HDGF isexpressed ubiquitously in normal tissues and tumor cell lines. It wasthen suggested that it is a novel heparin-binding protein with mitogenicactivity for fibroblasts. By PCR screening of a commercialmonochromosomal hybrid panel, investigators described the gene encodingHDGF in Wanschura, S., et al., in “Mapping of the gene encoding thehuman hepatoma-derived growth factor (HDGF) with homology to thehigh-mobility group (HMG)-1 protein to Xq25,” Genomics 32: 298-300, 1996mapped HDGF to the X chromosome. By FISH, they refined the localizationto Xq25. Subsequently, however, the International Radiation HybridMapping Consortium mapped the HDGF gene to chromosome 1. Amberger, J. S.Personal Communication. Baltimore, Md. Dec. 11, 2007 refined thelocalization to 1q21 based on an alignment of the HDGF sequence (GenBankD16431 with the genomic sequence (build 36.2). HDGF in Mus musculusbears Accession number NP_032257.

B. VEGF

Another growth factor known as VEGF was purified by Gospodarowicz et al.(1989) and Ferrara and Henzel (1989) from conditioned medium of bovinepituitary folliculo-stellate cells. An endothelial cell proliferationassay was used to monitor the biological activity of the protein.Vascular endothelial growth factor (VEGF), originally known as vascularpermeability factor (VPF), is a signal protein produced by cells thatstimulates vasculogenesis and angiogenesis. VEGF is part of a largersystem that restores the oxygen supply to tissues when blood circulationis inadequate such as in hypoxic conditions. It has been noted that VEGFserum concentration is high in bronchial asthma and diabetes mellitus.VEGF's normal function is to create new blood vessels during embryonicdevelopment, new blood vessels after injury, muscle following exercise,and new vessels (collateral circulation) to bypass blocked vessels.

When VEGF is overexpressed, it can contribute to disease. Solid cancerscannot grow beyond a limited size without an adequate blood supply.Cancer cells that can express VEGF are able to grow and metastasize.Overexpression of VEGF can cause vascular disease in the retina of theeye and other parts of the body. Drugs such as aflibercept, bevacizumab,and ranibizumab can inhibit VEGF and control or slow those diseases.

More specifically, VEGF is a sub-family of growth factors, theplatelet-derived growth factor family of cystine-knot growth factors.They are important signaling proteins involved in both vasculogenesis(the de novo formation of the embryonic circulatory system) andangiogenesis (the growth of blood vessels from pre-existingvasculature). The VEGF family comprises in mammals five members: VEGF-A,placenta growth factor (PGF), VEGF-B, VEGF-C and VEGF-D. See Table 2,below.

TABLE 2 VEGF family Type Function VEGF-A Angiogenesis ↑ Migration ofendothelial cells ↑ mitosis of endothelial cells ↑ Matrixmetalloproteinase activity ↑ αvβ3 activity creation of blood vessellumen creates fenestrations Chemotactic for macrophages and granulocytesVasodilation (indirectly by NO release) VEGF-B Embryonic angiogenesis(myocardial tissue, to be specific) VEGF-C Lymphangiogenesis VEGF-DNeeded for the development of lymphatic vasculature surrounding lungbronchioles PIGF Important for Vasculogenesis, Also needed forangiogenesis during ischemia, inflammation, wound healing, and cancer.Adapted from Wikipedia

VEGF-A has been correlated with poor prognosis in breast cancer.Numerous studies show a decreased overall survival and disease-freesurvival in those tumors overexpressing VEGF. The overexpression ofVEGF-A may be an early step in the process of metastasis, a step that isinvolved in the “angiogenic” switch. Although VEGF-A has been correlatedwith poor survival, its exact mechanism of action in the progression oftumors remains unclear. VEGF-A is also released in rheumatoid arthritisin response to TNF-α, increasing endothelial permeability and swellingand also stimulating angiogenesis. VEGF-A is also implicated in diabeticretinopathy (DR). The microcirculatory problems in the retina of peoplewith diabetes can cause retinal ischemia, which results in the releaseof VEGF-A. This can cause the creation of new blood vessels in theretina and elsewhere in the eye, heralding changes that may threaten thesight. VEGF-A plays a role in the disease pathology of the wet formage-related macular degeneration (AMD), which is the leading cause ofblindness for the elderly of the industrialized world. The vascularpathology of AMD shares certain similarities with diabetic retinopathy,although the cause of disease and the typical source ofneovascularization differ between the two diseases. Once released,VEGF-A may elicit several responses. It may cause a cell to survive,move, or further differentiate. Hence, VEGF is a potential target forthe treatment of cancer. The first anti-VEGF drug, a monoclonal antibodynamed bevacizumab, was approved in 2004. Approximately 10-15% ofpatients benefit from bevacizumab therapy; however, biomarkers forbevacizumab efficacy are not yet known. VEGF-D serum levels aresignificantly elevated in patients with angiosarcoma. Patients sufferingfrom pulmonary emphysema have been found to have decreased levels ofVEGF in the pulmonary arteries. In the kidney, increased expression ofVEGF-A in glomeruli directly causes the glomerular hypertrophy that isassociated with proteinuria. VEGF alterations can be predictive ofearly-onset pre-eclampsia.

C. TGFβ

A growth factor known as transforming growth factor beta (TGF-β) is amultifunctional cytokine belonging to the transforming growth factorsuperfamily that includes three different isoforms (TGF-β1 to 3, HGNCsymbols TGFB1, TGFB2, TGFB3) and many other signaling proteins producedby all white blood cell lineages. Activated TGF-β complexes with otherfactors to form a serine/threonine kinase complex that binds to TGF-βreceptors, which is composed of both type 1 and type 2 receptorsubunits. After the binding of TGF-β, the type 2 receptor kinasephosphorylates and activates the type 1 receptor kinase that activates asignaling cascade. This leads to the activation of different downstreamsubstrates and regulatory proteins, inducing transcription of differenttarget genes that function in differentiation, chemotaxis,proliferation, and activation of many immune cells.

TGF-β is secreted by many cell types, including macrophages, in a latentform in which it is complexed with two other polypeptides, latentTGF-beta binding protein (LTBP) and latency-associated peptide (LAP).Serum proteinases such as plasmin catalyze the release of active TGF-βfrom the complex. This often occurs on the surface of macrophages wherethe latent TGF-β complex is bound to CD36 via its ligand,thrombospondin-1 (TSP-1). Inflammatory stimuli that activate macrophagesenhance the release of active TGF-β by promoting the activation ofplasmin Macrophages can also endocytose IgG-bound latent TGF-β complexesthat are secreted by plasma cells and then release active TGF-β into theextracellular fluid. Among its key functions is regulation ofinflammatory processes, particularly in the gut.^([4]) TGF-β also playsa crucial role in stem cell differentiation as well as T-cell regulationand differentiation. As such, it is a highly researched cytokine in thefields of cancer, auto-immune diseases, and infectious disease.

The TGFβ superfamily includes endogenous growth inhibiting proteins; anincrease in expression of TGFβ often correlates with the malignancy ofmany cancers and a defect in the cellular growth inhibition response toTGFβ. Its immunosuppressive functions then come to dominate,contributing to oncogenesis. The dysregulation of its immunosuppressivefunctions is also implicated in the pathogenesis of autoimmune diseases,although their effect is mediated by the environment of other cytokinespresent.

The primary three types are:

-   -   TGF beta 1—TGFB1    -   TGF beta 2—TGFB2    -   TGF beta 3—TGFB3

The peptide structures of the TGF-β isoforms are highly similar(homologies on the order of 70-80%). They are all encoded as largeprotein precursors; TGF-β1 contains 390 amino acids and TGF-β2 andTGF-β3 each contain 412 amino acids. They each have an N-terminal signalpeptide of 20-30 amino acids that they require for secretion from acell, a pro-region called latency associated peptide (LAP), and a112-114 amino acid C-terminal region that becomes the mature TGF-βmolecule following its release from the pro-region by proteolyticcleavage. The mature TGF-β protein dimerizes to produce a 25 KDa activeprotein with many conserved structural motifs. TGF-β has nine cysteineresidues that are conserved among its family Eight form disulfide bondswithin the protein to create a cysteine knot structure characteristic ofthe TGF-β superfamily. The ninth cysteine forms a disulfide bond withthe ninth cysteine of another TGF-β protein to produce a dimer. Manyother conserved residues in TGF-β are thought to form secondarystructure through hydrophobic interactions. The region between the fifthand sixth conserved cysteines houses the most divergent area of TGF-βproteins that is exposed at the surface of the protein and is implicatedin receptor binding and specificity of TGF-β.

In normal cells, TGFβ, acting through its signaling pathway, stops thecell cycle at the G1 stage to stop proliferation, inducedifferentiation, or promote apoptosis. In many cancer cells, parts ofthe TGFβ signaling pathway are mutated, and TGFβ no longer controls thecell. These cancer cells proliferate. The surrounding stromal cells(fibroblasts) also proliferate. Both cells increase their production ofTGFβ. This TGFβ acts on the surrounding stromal cells, immune cells,endothelial and smooth-muscle cells. It causes immunosuppression andangiogenesis, which makes the cancer more invasive. TGFβ also convertseffector T-cells, which normally attack cancer with an inflammatory(immune) reaction, into regulatory (suppressor) T-cells, which turn offthe inflammatory reaction.

4. Overview

HDGF, VEGF, and TGFβ are overexpressed in hyperproliferative conditionssuch as keloids, lung fibrosis and lung cancer. The overexpressioncorrelates with aggressive biologic behaviors and poor clinicaloutcomes. Monoclonal antibodies specific for HDGF and chimeric andhumanized versions of them (i.e., H3, C1, C4, and L5-9) have beenpreviously developed by us and are provided in Table 1 and described inRen, H. et al., “Antibodies targeting hepatoma-derived growth factor asa novel strategy in treating lung cancer,” Mol Cancer Ther. 2009 May; 8(5): 1106-1112 and incorporated herein. Ren et al. determined thatanti-HDGF was effective to inhibit tumor growth in non-small cell lungcancer xenograft models. When the monoclonal antibody H3 was combinedwith either bevacizumab or gemcitabine, tumor growth inhibition wasenhanced. Here, chimeric and humanized bifunctional antibodies have beencreated (i.e., H3K, hH3K, H3T, and hH3T) to simultaneously target twoadditional growth factors (VEGF and TGFβ) in tumor tissue. Inpatient-derived tumor xenograft mouse models, treatment with thebi-functional antibody H3K interfered with tumor drug resistance anddemonstrated long-term remission. In mouse models of lung fibrosis,anti-HDGF antibodies in various combinations before or afterbleomycin-induced damage showed therapeutic effects on survival andinhibition of fibrosis. Without being bound by theory, treatment ofabnormal proliferation of fibrobasts with the bi-functional antibodies(i.e., H3K, hH3K, H3T, and hH3T) will provide an improved response inview of the simultaneous targeting of HDGF and VEGF or HDGF and TGFβ.This novel molecule targeting HDGF, with a VEGF trap or TGFβ trap iseasier to administer as a single molecule and enhances treatment byproviding equal or better effects while triggering ADCC in cancer cells.Strategies are also provided herein for reducing abnormal proliferationof fibroblasts using antibodies described in Table 1.

5. Embodiments

Therefore, embodiments of the invention include a bifunctionalhepatoma-derived growth factor (HDGF)-specific antibody molecule (e.g.,H3K, hH3K, H3T and hH3T) comprising at least one complementaritydetermining region (CDR) specific for HDGF and at least one receptordomain that specifically binds to a growth factor selected from vascularendothelial growth factor (VEGF) and transforming growth factor beta(TGFβ). In other embodiments, a single chain antibody (scFv) is createdand can be combined with a variety of functional moieties. In someembodiments, pharmaceutical compositions comprising the bifunctionalhepatoma-derived growth factor (HDGF)-specific antibody with apharmaceutically acceptable carrier are provided. The pharmaceuticalcomposition may be formulated for parenteral, intravenous or topicaladministration. Preferably the pharmaceutical composition is formulatedfor administration in an amount from 5 to 25 mg/kg every 1-3 weeks.Further embodiments include methods reducing the growth ofhyperproliferative cells in a subject by administering to the subjectthe bifunctional hepatoma-derived growth factor (HDGF)-specific antibodyin art amount of that down regulates HDGF and VEGF expression or HDGFand TGFβ expression and is effective to reduce the abnormal growth ofthe hyperproliferative cells. In some embodiments, thehyperproliferative cell may be a fibroblast or a cancer cell, or avascular endothelial cell. The cancer cell may be selected from thegroup consisting of lung, pancreas, colon, ovarian, liver, glioblastoma,and squamous cell carcinoma. And in other embodiments, methods areprovided for simultaneously reducing expression of HDGF and VEGF or HDGFand TGFβ in a subject in need thereof by administering bifunctionalhepatoma-derived growth factor (HDGF)-specific antibody. The subject inneed suffers from a hyperproliferative condition selected from the groupconsisting of interstitial lung disease, keloids, lung fibrosis,idiopathic pulmonary fibrosis, lung cancer, pancreatic cancer, coloncancer, ovarian cancer, liver cancer, glioblastoma, diabeticretinopathy, age-related macular degeneration, and squamous cellcarcinoma.

A. Bi-Functional Molecules and Methods of Making them

Some embodiments of the invention include a bifunctionalhepatoma-derived growth factor (HDGF)-specific chimeric or humanizedantibody (e.g., H3K hH3K, H3T or hH3T) and each comprises at least onecomplementarity determining region (CDR) specific for HDGF and at leastone receptor domain that specifically binds to a growth factor selectedfrom vascular endothelial growth factor (VEGF) and transforming growthfactor beta (TGFβ). The CDR may be selected from a mouse, human, rabbit,rat, CDR, preferably a mouse CDR. The antibody may be humanized orchimeric and comprises two receptor domains (e.g., VEGFR2) each of whichindependently bind to a growth factor selected from vascular endothelialgrowth factor (VEGF-A, VEGF-C, and VEGF-E) and transforming growthfactor beta (TGFβ) (i.e., a TGFβ selected from TGFβ subtype 1, subtype2, and subtype 3). In certain aspects the bifunctional hepatoma-derivedgrowth factor (HDGF)-specific antibody is linked to a reporter moleculeselected from the group consisting of, an enzyme, a radiolabel, ahapten, a fluorescent label, a phosphorescent molecule, achemiluminescent molecule, a chromophore, a luminescent molecule, aphotoaffinity molecule, a ligand, a colored particle or biotin. In thealternative, the antibody is linked to an effector molecule selectedfrom the group consisting of, a toxin, an apoptotic molecule, anantitumor agent, a therapeutic enzyme or a cytokine. In some aspects,the antitumor agent is selected from the group consisting ofgemcitabine, pemetrexed, cisplatin, docetaxel, vinorelbine, doxorubicin,6-fluorouracil, erlotinib, gefitinib, and crizotinib.

Embodiments include antibodies that are immunological proteins that binda specific antigen. In most mammals, including humans and mice,antibodies are constructed from paired heavy and light polypeptidechains. Each chain is made up of individual immunoglobulin (Ig) domains,and thus the generic term immunoglobulin is used for such proteins. Eachchain is made up of two distinct regions, referred to as the variableand constant regions. The light and heavy chain variable regions showsignificant sequence diversity between antibodies, and are responsiblefor binding the target antigen. The constant regions show less sequencediversity, and are responsible for binding a number of natural proteinsto elicit important biochemical events. In humans there are fivedifferent classes of antibodies including IgA (which includes subclassesIgA1 and IgA2), IgD, IgE, IgG (which includes subclasses IgG1, IgG2,IgG3, and IgG4), and IgM. The distinguishing features between theseantibody classes are their constant regions, although subtlerdifferences may exist in the V region. IgG antibodies are tetramericproteins composed of two heavy chains and two light chains. The IgGheavy chain is composed of four immunoglobulin domains linked from N- toC-terminus in the order VH-CH1-CH2-CH3, referring to the heavy chainvariable domain, heavy chain constant domain 1, heavy chain constantdomain 2, and heavy chain constant domain 3 respectively (also referredto as VH-Cγ1-Cγ2-Cγ3, referring to the heavy chain variable domain,constant γ1 domain, constant γ2 domain, and constant γ3 domainrespectively). The IgG light chain is composed of two immunoglobulindomains linked from N- to C-terminus in the order VL-CL, referring tothe light chain variable domain and the light chain constant domainrespectively.

In some embodiments, a chimeric antibody is an antibody made bycombining genetic material from a nonhuman source, like a mouse, withgenetic material from a human being. Chimeric antibodies are generallyaround two thirds human, reducing the risk of a reaction to foreignantibodies from a non-human animal when they are used in therapeutictreatments. A closely related concept is a humanized antibody, made in asimilar way but containing closer to 90% human genetic material. Usingrecombinant technology, people can cut and splice genetic material frommultiple sources and fuse it together. A chimeric antibody containsantibodies developed with animal cells in culture, with sections of thegenetic code replaced with human genes in order to address concernsabout a potential reaction with the animal's genetic material.

The variable region of the Fab-antigen binding region of antibodies insome embodiments contains the antigen binding determinants of themolecule, and thus determines the specificity of an antibody for itstarget antigen. The variable region is so named because it is the mostdistinct in sequence from other antibodies within the same class. Themajority of sequence variability occurs in the complementaritydetermining regions (CDRs). There are 6 CDRs total, three each per heavyand light chain, designated VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2,and VL CDR3. In preferred embodiments, the CDR is mouse CDR for HDGF.

In preferred embodiments, the CDR is a mouse CDR for HDGF. The variableregion outside of the CDRs is referred to as the framework (FR) region.Although not as diverse as the CDRs, sequence variability does occur inthe FR region between different antibodies. Overall, this characteristicarchitecture of antibodies provides a stable scaffold (the FR region)upon which substantial antigen binding diversity (the CDRs) can beexplored by the immune system to obtain specificity for a broad array ofantigens. A number of high-resolution structures are available for avariety of variable region fragments from different organisms, someunbound and some in complex with antigen. The sequence and structuralfeatures of antibody variable regions are well characterized (Morea etal., 1997, Biophys Chem 68:9-16; Morea et al., 2000, Methods 20:267-279,entirely incorporated by reference), and the conserved features ofantibodies have enabled the development of a wealth of antibodyengineering techniques (Maynard et al., 2000, Annu Rev Biomed Eng2:339-376, entirely incorporated by reference). For example, it ispossible to graft the CDRs from one antibody, for example a murineantibody, onto the framework region of another antibody, for example ahuman antibody. This process, referred to in the art as “humanization,”reduces the immunogenicity of antibody therapeutics compared to nonhumanantibodies. Fragments including the variable region can exist in theabsence of other regions of the antibody, including for example theantigen binding fragment (Fab) including VH-C.gamma.1 and VH-CL, thevariable fragment (Fv) including VH and VL, the single chain variablefragment (scFv) including VH and VL linked together in the same chain,as well as a variety of other variable region fragments (Little et al.,2000, Immunol Today 21:364-370, entirely incorporated by reference).

A Fab fragment is a monovalent fragment consisting of the VL, VH, CL andCH I domains; a F(ab′)₂ fragment is a bivalent fragment comprising twoFab fragments linked by a disulfide bridge at the hinge region; a Fdfragment consists of the VH and CH1 domains; an Fv fragment consists ofthe VL and VH domains of a single arm of an antibody; and a dAb fragment(Ward et al., Nature 341:544 546, 1989) consists of a VH domain. Asingle-chain antibody (scFv) is an antibody in which a VL and VH regionsare paired to form a monovalent molecules via a synthetic linker thatenables them to be made as a single protein chain (Bird et al., Science242:423 426, 1988 and Huston et al., Proc. Natl. Acad. Sci. USA 85:58795883, 1988). Such linker molecules are commonly known in the art anddescribed in U.S. Patent Application No. 20130245233 A1, Denardo et al.,(1998) Clin Cancer Res. 4(10):2483-90; Peterson et al., (1999)Bioconjug. Chem. 10(4):553-7; and Zimmerman et al., (1999) Nucl. Med.Biol. 26(8):943-50, each incorporated by reference in their entireties.Diabodies are bivalent, bispecific, or bi-functional antibodies in whichVH and VL domains are expressed on a single polypeptide chain, but usinga linker that is too short to allow for pairing between the two domainson the same chain, thereby forcing the domains to pair withcomplementary domains of another chain and creating two antigen bindingsites (see e.g., Holliger, P., et al., Proc. Natl. Acad. Sci. USA90:6444 6448, 1993, and Poljak, R. J., et al., Structure 2:1121 1123,1994). One or more CDRs may be incorporated into a molecule eithercovalently or noncovalently to make it bispecific.

An Fc-effector binding region is a fragment containing a constantregion, termed the Fe domain, which engages a diversity of cellularreceptors, thereby triggering antibody-mediated effector functions. TheFe domain acts as a bridge between the specificity dictated by the Fabregion and cells of the innate and adaptive immune system. A notablecommon characteristic of both classes of therapeutic antibodies is theimportance of the IgG Fc domain, which connects the fine specificity ofan antibody with immune cells that mediate antibody-triggered effectorfunctions through their engagement of Fc receptor (FcR) family members.In antibody dependent cellular cytotoxicity (ADCC), FcvRs on the surfaceof effector cells (natural killer cells, macrophages, monocytes andeosinophils) bind to the Fc region of an IgG which itself is bound to atarget cell. Engineering the antibody Fc region to enhance the cytotoxicactivity of therapeutic antibodies is preferred in some embodiments. Inpreferred embodiments, the Fc-effort region comprises a human VEGF/TGFβtrap. The growth factor receptor dimers bind GF dimer. Fusion with theheavy chain creates a receptor dimer which may be required or enhancethe binding of GF.

In preferred embodiments, anti-HDGF hybridoma Balb/c mice were immunizedwith recombinant HDGF in Freund's adjuvant. Solenocytes from immunizedanimals were fused with P3x63Ag8.653 cells and screened for HDGFreactivity in the culture supernatant. Positive clones were identifiedand anti-HDGF antibody secretion was verified by immunoblot analysis ofcancer cell lysate and purified HDGF. RNA from anti-HDGF antibodyproducing hybridoma was extracted, reverse transcribed into cDNA.Primers designed to amplify the Ig variable region (Larrick, J. W., etal. 1989. Biochem. Biophys. Res. Comm 160, 1250. Jones, S. T. andBendig, M. M. 1991. Biotechnology 9, 88) were used to amplify the cDNAencoding the mouse Ig heavy and light chain. The amplified product werecloned and sequenced. The cDNA sequence that encoded the murine Ig heavychain and light chain, and the CDRs were identified as described inhttp://www.bioinf.org.uk/abs/. The DNA fragments that encoded the murineantibody variable domain (VH and VL) were grafted to the N-terminal ofthe constant region of their human IgG1 count part by standard molecularbiology techniques, and cloned into a mammalian expression vectorrespectively. To produce the chimeric antibody, plasmids encoding forthe heavy and light chain were co-transfected into Expi293 cells(Invitrogen®) at a ratio of 1:2. The antibody was purified from theconditioned media by protein G affinity chromatograph. The cDNA sequencethat encoded the murine Ig heavy chain and light chain, and the CDRswere identified as described by Martin A.C.R.(http://www.bioinf.org.uk/abs/). The humanized anti-HDGF Vh sequenceswere then created by replacing the CDRs in human Ig G1 Vh with thecorresponding murine CDRs. The DNA sequence that encode the humanizedsequence is then synthesized and grafted on the N-termini of the humanIgG1 heavy chain constant region, cloned into a mammalian expressionvector to generate a humanized Ig heavy chain expression construct. Thehumanized VL expression construct was created similarly. To produce thehumanized anti-HDGF antibody, the plasmids that encode for the heavy andlight chain was used to transfect Expi293 cell at a ratio of 1:2. Theantibody was purified from the conditioned media by protein G affinitychromatograph.

Construction of Fc-fused growth factor binding domain (GF trapper)included a DNA fragment corresponding to domain 2 and 3 (D2 and D3) ofhuman VEGF receptor 2 (kinase insert domain receptor) amino acid residue122 to residue 327 (based on NP_002253) and was amplified from HEK 293cDNA. The amplified sequence was fused to the C-terminus of the humanIgG1 heavy chain via a poly-GlySer linker, (GlyGlyGlyGlySer) a (SEQ IDNO:23), or (G4S) 2. The full-length anti-HDGF antibody heavy chain-VEGFtrapper sequence was cloned into a mammalian expression plasmid.

Construction of Fc-TGFB trapper included a DNA fragment corresponding tohuman TGFBR2 extracellular domain amino acid residue 27 to residue 184(based on NP_001020018) was amplified from human lung cDNA. Theamplified sequence was fused to the C-terminus of the human IgG1 heavychain via a poly-GlySer linker, (GlyGlyGlyGlySer) a (SEQ ID NO:23), or(G4S) 2. The full-length anti-HDGF antibody heavy chain-TGFB trappersequence was cloned into a mammalian expression plasmid. To produce therecombinant anti-HDGF antibody, plasmids encoding for the heavy andlight chain were co-transfected into Expi293 cells (Invitrogen®) at aratio of 1:2. The antibody was purified from the conditioned media byprotein G affinity chromatograph.

Chimeric antibodies may be generated by substituting all constant regionsequences of a non-human (such as murine) antibody with constant regionsequences of human origin or vice versa. Thus, fully non-human variableregion sequences are maintained in the chimeric antibody. Thus, achimeric antibody according to the present invention may be produced bya method comprising the step of expressing the non-human variable heavychain, non-human variable light chain sequences, human constant heavychain and human constant light chain sequences in suitable expressionsystems, and thereby generating a full-length chimeric antibody.Alternative methods may be used. Such methods of producing a chimericantibody is within the knowledge of the skilled person, and thus, theskilled person would know how to produce a chimeric antibody accordingto the present invention.

The term “recombinant human antibody,” as used herein, is intended toinclude all human antibodies that are prepared, expressed, created orisolated by recombinant means, such as (a) antibodies isolated from ananimal (e.g., a mouse) that is transgenic for human immunoglobulingenes, (b) antibodies expressed using a recombinant expression vectortransfected into a host cell, (c) antibodies isolated from arecombinant, combinatorial human antibody library, and (c) antibodiesprepared, expressed, created or isolated by any other means that involvesplicing of human immunoglobulin gene sequences to other DNA sequences.Such recombinant human antibodies preferably have variable and constantregions derived from human germline immunoglobulin sequences. In certainembodiments, however, such recombinant human antibodies can be subjectedto in vitro mutagenesis (or, when an animal transgenic for human Igsequences is used, in vivo somatic mutagenesis) and thus the amino acidsequences of the VH and VL regions of the recombinant antibodies aresequences that, while derived from and related to human germline V_(H)and V_(L) sequences, may not naturally exist within the human antibodygermline repertoire in vivo. Antigen-binding portions include, interalia, Fab, Fab′, F(ab′)₂, Fv, dAb, and complementarity determiningregion (CDR) fragments, single-chain antibodies (scFv), chimericantibodies, diabodies and polypeptides that contain at least a portionof an immunoglobulin that is sufficient to confer specific antigenbinding to the target ceramide. Also included in the definition ofantibodies is the SuperAntibody including those chemically conjugated toT15 peptide or genetically-engineered into a human IgG1 backbone (see Y.Zhao, D. Lou, J. Burkett and H. Kohler. Enhanced Anti-B-cell TumorEffects with Anti-CD20 SuperAntibody. J. Immunotherapy, 25: 57-62,2002). The immunoglobulin subtype can be any subtype; typically IgG andIgM are used, but IgA, IgE etc. also can be effective.

In preferred embodiments, the chimeric antibody may have one or morebinding sites and is a bifunctional hepatoma-derived growth factor(HDGF)-specific chimeric or humanized antibody (e.g., H3K hH3K, H3T orhH3T). If there is more than one binding site, the binding sites may beidentical to one another or may be different. For instance, anaturally-occurring immunoglobulin has two identical binding sites, asingle-chain antibody or Fab fragment has one binding site, while a“bispecific” or “bifunctional” antibody has two different binding sites.

In some embodiments, the carboxy termini of the chimeric H3 heavy chainis fused to a soluble VEGF receptor (VEGF trapper). The VEGF trapperpreferably is made by fusing the VEGF receptor 2 (VEGFR2) ligand bindingdomain with another protein at the carboxyl terminal via a linker. Inthis instance, the ligand binding domain consists of sequences from D2and D3 of VEGFR2; the linker sequence here is a tandem repeat of G4S,but other types of linker, such as a polypeptide or synthetic linker,are possible. In some embodiments, the VEGF trapper is constructed usingthe ligand binding domain of VEGFR1, VEGFR2 or VEGFR3; or a hybridligand binding domain consisting of a D2 domain selected from VEGFR1,VEGFR2 or VEGFR3, and a D3 domain selected from VEGFR1, VEGFR2 orVEGFR3; or a hybrid ECD consisting of the fusion of a D2 domaincontaining ECD and a D3 domain containing ECD. See FIGS. 15A and 15B forexamples of VEGF trapper constructions.

Without being bound by theory, the majority of the methods of making asoluble receptor derived from type I trans membrane protein/type Ireceptor is to fuse the N-terminal extracellular domain to the N-terminiof Fc fragment due to: 1) the natural topology of the receptor protein,2) the requirement of many of these receptors to dimerize upon bindingthe ligand which is often dimerized, 3) favorable PK due to similarityto antibody. Although expression as Fc fusion protein is the easiestway, it is possible to make multi-functional molecule or nanoparticle bycovalent or non-covalent conjugation of VEGFR monomer or dimer, as longas it can form a dimer before or upon GF dimer binding.

The VEGF trapper has an amino acid sequence set forth in SEQ ID NO:1.Embodiments including a VEGF trapper preferably have the VEGF trapperfused at the carboxyl termini of the human IgG heavy chain. In thefollowing example, a human IgG1 heavy chain constant region and the VEGFbinding domain are shown in SEQ ID NO:2. In other embodiments, the VEGFtrapper was fused at the carboxyl termini of a chimeric H3 heavy chain.In the following example, a human IgG1 heavy chain constant region andVEGF binding domain is shown in SEQ ID NO:3. The VEGF trapperalternatively was fused at the carboxyl termini of a humanized anti-HDGFH3 heavy chain (matured peptide) in other embodiments as shown in SEQ IDNO: 4. In this instance, the TGFB trapper is shown as acarboxyl-terminal fusion via a linker in SEQ ID NO:5. The linker is(G4S) 2. Other alternative embodiments include a TGFB trapper fused atthe carboxyl termini of human IgG heavy chain (SEQ ID NO:6). In afurther alternative embodiment, the TGFB trapper was fused at thecarboxyl termini of chimeric anti-HDGF H3 heavy chain (SEQ ID NO:7). Inother embodiments, the TGFB trapper was fused at the carboxyl termini ofhumanized anti-HDGF H3 heavy chain (matured peptide) (SEQ ID NO:8).

B. Biologically Active Fragments and Variants

As indicated above, the term “antibody” as used herein, unless otherwisestated or clearly contradicted by context, includes any fragment of anantibody that retains the ability to specifically interact, such asbind, to the antigen. It has been shown that the antigen-bindingfunction of an antibody may be performed by fragments of a full-lengthantibody. Examples of binding fragments encompassed within the term“antibody” include (i) a Fab′ or Fab fragment, a monovalent fragmentconsisting of the V_(L), V_(H), C_(L) and C_(H1) domains, or amonovalent antibody as described in WO2007059782 (Genmab A/S); (ii)F(ab′)₂ fragments, bivalent fragments comprising two Fab fragmentslinked by a disulfide bridge at the hinge region; (iii) a Fd fragmentconsisting essentially of the V_(H) and C_(.H1) domains; and (iv) a Fvfragment consisting essentially of the V_(L) and V_(H) domains of asingle arm of an antibody. Furthermore, although the two domains of theFv fragment, V_(L) and V_(H), are coded for by separate genes, they maybe joined, using recombinant methods, by a synthetic linker that enablesthem to be made as a single protein chain in which the V_(L) and V_(H)regions pair to form monovalent molecules (known as single chainantibodies or single chain Fv (scFv), see for instance Bird et al.,Science 242, 423-426 (1988) and Huston et al., PNAS USA 85, 5879-5883(1988)). Such single chain antibodies are encompassed within the termantibody unless otherwise noted or clearly indicated by context.Although such fragments are generally included within the meaning ofantibody, they collectively and each independently are unique featuresof the present invention, exhibiting different biological properties andutility. These and other useful antibody fragments in the context of thepresent invention are discussed further herein. It also should beunderstood that the term antibody, unless specified otherwise, alsoincludes polyclonal antibodies, monoclonal antibodies (mAbs), chimericantibodies and humanized antibodies, and antibody fragments retainingthe ability to specifically bind to the antigen (antigen-bindingfragments) provided by any known technique, such as enzymatic cleavage,peptide synthesis, and recombinant techniques. An antibody as generatedcan possess any isotype.

“Biologically active fragments” of an antibody as used herein, mean anyfragment that retains binding affinity for HDGF. The fragments retainone or more CDR regions from the original antibody. CDRs are the sitesof the antibody that bind to the antigen and in most cases are unique tothat antibody. In order for a fragment to retain binding to the antigen,it would need to have at a set of CDRs with 3D structure such that theyare combined to form a binding pocket or the like. Biologically activefragments may also contain minor variations provided that the variationsin the amino acid sequence maintain at least 75%, more preferably atleast 80%, 90%, 95%, and most preferably 99% sequence identity and themolecule retains its affinity for binding.

“Variants” of a bi-functional chimeric antibody or fragment thereofinclude amino acid sequence modification(s) of the antibodies describedherein that may, for example, improve the binding affinity and/or otherbiological properties of the antibody for the intended purpose oftreating or mitigating an enumerated disease Amino acid sequencevariants of the antibody may be prepared by introducing appropriatechanges into the nucleotide sequence encoding the antibody, or bypeptide synthesis. Such modifications include, for example, deletionsfrom, and/or insertions into and/or substitutions of, residues withinthe amino acid sequences of the antibody. Any combination of deletion,insertion, and substitution can be made to arrive at the finalconstruct, provided that the final construct possesses the desiredaffinity for HDGF. The amino acid alterations may be introduced in thesubject antibody amino acid sequence at the time that sequence is made.

Fragments or analogs of antibodies can be readily prepared by those ofordinary skill in the art following the teachings of this specification.Preferred amino- and carboxy-termini of fragments or analogs occur nearboundaries of functional domains. Structural and functional domains canbe identified by comparison of the nucleotide and/or amino acid sequencedata to public or proprietary sequence databases. Preferably,computerized comparison methods are used to identify sequence motifs orpredicted protein conformation domains that occur in other proteins ofknown structure and/or function. Methods to identify protein sequencesthat fold into a known three-dimensional structure are known. Bowie etal. Science 253:164 (1991).

C. Pharmaceutical Compositions

In some embodiments, pharmaceutical compositions comprising thebifunctional hepatoma-derived growth factor (HDGF)-specific antibodywith a pharmaceutically acceptable carrier are provided. Thepharmaceutical composition may be formulated for parenteral, intravenousor topical administration. Preferably the pharmaceutical composition isformulated for administration in an amount from 5 to 25 mg/kg every 1-3weeks. The pharmaceutical compositions may be formulated withpharmaceutically acceptable carriers or diluents as well as any otherknown adjuvants and excipients in accordance with conventionaltechniques known in the art.

The pharmaceutically acceptable carriers or diluents as well as anyother known adjuvants and excipients should be suitable for thehumanized or chimeric antibodies of the present invention and the chosenmode of administration. Suitability for carriers and other components ofpharmaceutical compositions is determined based on the lack ofsignificant negative impact on the desired biological properties of thechosen compound or pharmaceutical composition of the present invention(e.g., less than a substantial impact (10% or less relative inhibition,5% or less relative inhibition, etc.)) on antigen binding.

Pharmaceutically acceptable carriers include any and all suitablesolvents, dispersion media, coatings, antibacterial and antifungalagents, isotonicity agents, antioxidants and absorption-delaying agents,and the like that are physiologically compatible with a humanized orchimeric antibody of the present invention. Examples of suitable aqueousand nonaqueous carriers which may be employed in the pharmaceuticalcompositions of the present invention include water, saline, phosphatebuffered saline, ethanol, dextrose, polyols (such as glycerol, propyleneglycol, polyethylene glycol, and the like), and suitable mixturesthereof, vegetable oils, such as olive oil, corn oil, peanut oil,cottonseed oil, and sesame oil, carboxymethyl cellulose colloidalsolutions, tragacanth gum and injectable organic esters, such as ethyloleate, and/or various buffers. Other carriers are well known in thepharmaceutical arts.

Pharmaceutically acceptable carriers include sterile aqueous solutionsor dispersions and sterile powders for the extemporaneous preparation ofsterile injectable solutions or dispersion. The use of such media andagents for pharmaceutically active substances is known in the art.Except insofar as any conventional media or agent is incompatible withthe active compound, use thereof in the pharmaceutical compositions ofthe present invention is contemplated. When referring to the “activecompound” it is contemplated to also refer to the humanized or chimericantibody according to the present invention.

Proper fluidity may be maintained, for example, by the use of coatingmaterials, such as lecithin, by the maintenance of the required particlesize in the case of dispersions, and by the use of surfactants.

A pharmaceutical composition of the present invention may also includediluents, fillers, salts, buffers, detergents (e.g., a nonionicdetergent, such as Tween-20 or Tween-80), stabilizers (e.g., sugars orprotein-free amino acids), preservatives, tissue fixatives,solubilizers, and/or other materials suitable for inclusion in apharmaceutical composition.

The actual dosage levels of the active ingredients in the pharmaceuticalcompositions of the present invention may be varied so as to obtain anamount of the active ingredient which is effective to achieve thedesired therapeutic response for a particular patient, composition, andmode of administration, without being toxic to the patient. The selecteddosage level will depend upon a variety of pharmacokinetic factorsincluding the activity of the particular compositions of the presentinvention employed, or the amide thereof, the route of administration,the time of administration, the rate of excretion of the particularcompound being employed, the duration of the treatment, other drugs,compounds and/or materials used in combination with the particularcompositions employed, the age, sex, weight, condition, general healthand prior medical history of the patient being treated, and like factorswell known in the medical arts.

The pharmaceutical composition may be administered by any suitable routeand mode. Suitable routes of administering a humanized or chimericantibody of the present invention in vivo and in vitro are well known inthe art and may be selected by those of ordinary skill in the art.

In one embodiment, a pharmaceutical composition of the present inventionis administered parenterally. The phrases “parenteral administration”and “administered parenterally” as used herein means modes ofadministration other than enteral and topical administration, usually byinjection, and include epidermal, intravenous, intramuscular,intra-arterial, intrathecal, intracapsular, intra-orbital, intracardiac,intradermal, intraperitoneal, intratendinous, local injection,transtracheal, subcutaneous, subcuticular, intra-articular, subcapsular,subarachnoid, intraspinal, intracranial, intrathoracic, epidural andintrasternal injection and infusion.

In one embodiment that pharmaceutical composition is administered byintravenous or subcutaneous injection or infusion. The pharmaceuticalcompositions of the present invention may also contain one or moreadjuvants appropriate for the chosen route of administration such aspreservatives, wetting agents, emulsifying agents, dispersing agents,preservatives or buffers, which may enhance the shelf life oreffectiveness of the pharmaceutical composition. The humanized orchimeric antibody of the present invention may be prepared with carriersthat will protect the compound against rapid release, such as acontrolled release formulation, including implants, transdermal patches,and micro-encapsulated delivery systems. Such carriers may includegelatin, glyceryl monostearate, glyceryl distearate, biodegradable,biocompatible polymers such as ethylene vinyl acetate, polyanhydrides,polyglycolic acid, collagen, poly-orthoesters, and polylactic acid aloneor with a wax, or other materials well known in the art. Methods for thepreparation of such formulations are generally known to those skilled inthe art.

In one embodiment, the humanized or chimeric antibody of the presentinvention may be formulated to ensure proper distribution in vivo.Pharmaceutically acceptable carriers for parenteral administrationinclude sterile aqueous solutions or dispersions and sterile powders forthe extemporaneous preparation of sterile injectable solutions ordispersions. The use of such media and agents for pharmaceuticallyactive substances is known in the art. Except insofar as anyconventional media or agent is incompatible with the active compound,use thereof in the pharmaceutical compositions of the present inventionis contemplated. Other active or therapeutic compounds may also beincorporated into the compositions.

Pharmaceutical compositions for injection must typically be sterile andstable under the conditions of manufacture and storage. The compositionmay be formulated as a solution, micro-emulsion, liposome, or otherordered structure suitable to high drug concentration. The carrier maybe an aqueous or a non-aqueous solvent or dispersion medium containingfor instance water, ethanol, polyols (such as glycerol, propyleneglycol, polyethylene glycol, and the like), and suitable mixturesthereof, vegetable oils, such as olive oil, and injectable organicesters, such as ethyl oleate. The proper fluidity may be maintained, forexample, by the use of an emulsifier such as lecithin that can beapplied as a coating, by the maintenance of the required particle sizein the case of dispersion and by the use of surfactants. In many cases,it will be preferable to include isotonic agents, for example, sugars,polyalcohols such as glycerol, mannitol, sorbitol, or sodium chloride inthe composition. Prolonged absorption of the injectable compositions maybe brought about by including in the composition an agent that delaysabsorption, for example, monostearate salts and gelatin. Sterileinjectable solutions may be prepared by incorporating the activecompound in the required amount in an appropriate solvent with one or acombination of ingredients e.g., as enumerated above, as required,followed by sterilization microfiltration. Generally, dispersions areprepared by incorporating the active compound into a sterile vehiclethat contains a basic dispersion medium and the required otheringredients e.g., from those enumerated above. In the case of sterilepowders for the preparation of sterile injectable solutions, examples ofmethods of preparation are vacuum drying and freeze-drying(lyophilization) that yield a powder of the active ingredient plus anyadditional desired ingredient from a previously sterile-filteredsolution thereof.

Sterile injectable solutions may be prepared by incorporating the activecompound in the required amount in an appropriate solvent with one or acombination of ingredients enumerated above, as required, followed bysterilization microfiltration. Generally, dispersions are prepared byincorporating the active compound into a sterile vehicle that contains abasic dispersion medium and the required other ingredients from thoseenumerated above. In the case of sterile powders for the preparation ofsterile injectable solutions, examples of methods of preparation arevacuum-drying and freeze-drying (lyophilization) that yield a powder ofthe active ingredient plus any additional desired ingredient from apreviously sterile-filtered solution thereof.

D. Therapeutic Applications

Chimeric antibodies have been developed for therapeutic use.Representative publications related to such therapies include Chamow etal., 1996, Trends Biotechnol. 14:52-60; Ashkenazi et al., 1997, Curr.Opin. Immunol. 9:195-200, Cragg et al., 1999, Curr. Opin. Immunol.11:541-547; Glennie et al., 2000, Immunol. Today 21:403-410, McLaughlinet al., 1998, J. Clin. Oncol. 16:2825-2833, and Cobleigh et al., 1999,J. Clin. Oncol. 17:2639-2648, all entirely incorporated by reference.Currently for anticancer therapy, any small improvement in mortalityrate defines success. Certain IgG variants disclosed herein enhance thecapacity of antibodies to limit further growth or destroy at leastpartially, targeted cancer cells.

Anti-tumor potency of antibodies is via enhancement of their ability tomediate cytotoxic effector functions such as ADCC, ADCP, and CDC.Examples include Clynes et al., 1998, Proc. Natl. Acad. Sci. USA95:652-656; Clynes et al., 2000, Nat. Med. 6:443-446 and Cartron et al.,2002, Blood 99:754-758, both entirely incorporated by reference.

Human IgG1 is the most commonly used antibody for therapeutic purposes,and the majority of engineering studies have been constructed in thiscontext. The different isotypes of the IgG class however, includingIgG1, IgG2, IgG3, and IgG4, have unique physical, biological, andclinical properties. There is a need in the art to design improved IgG1,IgG2, IgG3, and IgG4 variants. There is a further need to design suchvariants to improve binding to FcRn and/or increase in vivo half-life ascompared to native IgG polypeptides. The present application meets theseand other needs.

Further embodiments include methods reducing the growth ofhyperproliferative cells in a subject by administering to the subjectthe bifunctional hepatoma-derived growth factor (HDGF)-specific antibodyin an amount of that down regulates HDGF and VEGF expression or HDGF andTGFβ expression or both VEGF and TGFβ expression and is effective toreduce the abnormal growth of the hyperproliferative cells. It ispossible to co-administer a mixture of these antibodies (i.e., H3K+H3T)or with other antibody-based drugs such as Cetuximab or Herceptin. Insome embodiments, the hyperproliferative cell may be a fibroblast, or acancer cell, or a vascular endothelia cell. The cancer cell may beselected from the group consisting of lung, pancreas, colon, ovarian,liver, glioblastoma, and squamous cell carcinoma.

In some embodiments, methods are provided for simultaneously reducingexpression of HDGF and VEGF or HDGF and TGFβ in a subject in needthereof by administering bifunctional hepatoma-derived growth factor(HDGF)-specific antibody. The subject in need suffers from ahyperproliferative condition selected from the group consisting ofinterstitial lung disease, keloids, lung fibrosis, idiopathic pulmonaryfibrosis, lung cancer, pancreatic cancer, colon cancer, ovarian cancer,liver cancer, glioblastoma, diabetic retinopathy, age-related maculardegeneration, and squamous cell carcinoma.

In another aspect, the present invention relates to a humanized orchimeric antibody, or pharmaceutical composition of the invention asdefined in any aspect or embodiment herein described, for use in thetreatment of a disease.

The humanized or chimeric antibody or pharmaceutical composition of theinvention can be used as in the treatment of any cancer. For example,the humanized or chimeric antibody may be administered to cells inculture, e.g., in vitro or ex vivo, or to human subjects, e.g., in vivo,to treat or prevent disorders such as cancer, inflammatory or autoimmunedisorders. As used herein, the term “subject” is typically a human whichrespond to the humanized or chimeric antibody, or pharmaceuticalcomposition. Subjects may for instance include human patients havingdisorders that may be corrected or ameliorated by modulating a targetfunction or by leading to killing of the cell, directly or indirectly.

In another aspect, the present invention provides methods for treatingor preventing a hyperproliferative condition, such as keloids or lungfibrosis or diabetic retinopathy, or age-related macular degeneration,which method comprises administration of a therapeutically effectiveamount of a humanized or chimeric antibody, or pharmaceuticalcomposition of the present invention to a subject in need thereof. Themethod typically involves administering to a subject a humanized orchimeric antibody in an amount effective to treat or prevent thedisorder.

In one particular aspect, the present invention relates to a method oftreatment of lung cancer comprising administering the humanized orchimeric antibody or pharmaceutical composition of the invention asdefined in any aspect and embodiments herein described, to a subject inneed thereof.

In another aspect, the present invention relates to the use or themethod as defined in any aspect or embodiments herein described whereinthe humanized or chimeric antibody is a bi-functional antibodyspecifically binding to both VEGF or TGFβ or both and a cancer-specifictarget, or a target that is overexpressed in cancer or associated withcancer, such as HDGF and wherein the disease is cancer, such as breastcancer, prostate cancer, non-small cell lung cancer, bladder cancer,ovarian cancer, gastric cancer, colorectal cancer, esophageal cancer andsquamous cell carcinoma of the head & neck, cervical cancer, pancreaticcancer, testis cancer, malignant melanoma, a soft-tissue cancer (e.g.,synovial sarcoma), an indolent or aggressive form of B-cell lymphoma,chronic lymphatic leukemia or acute lymphatic leukemia.

E. Dosage and Administration

The efficient dosages and dosage regimens for the humanized or chimericantibody depend on the disease or condition to be treated and may bedetermined by the persons skilled in the art.

A physician having ordinary skill in the art may readily determine andprescribe the effective amount of the pharmaceutical compositionrequired. For example, the physician could start doses of the humanizedor chimeric antibody employed in the pharmaceutical composition atlevels lower than that required in order to achieve the desiredtherapeutic effect and gradually increase the dosage until the desiredeffect is achieved. In general, a suitable dose of a composition of thepresent invention will be that amount of the humanized or chimericantibody which is the lowest dose effective to produce a therapeuticeffect according to a particular dosage regimen. Such an effective dosewill generally depend upon the factors described above.

For example, an “effective amount” for therapeutic use may be measuredby its ability to stabilize the progression of disease. The ability of acompound to inhibit cancer may, for example, be evaluated in an animalmodel system predictive of efficacy in human tumors. Alternatively, thisproperty of a composition may be evaluated by examining the ability ofthe humanized or chimeric antibody to inhibit cell growth or to inducecytotoxicity by in vitro assays known to the skilled practitioner. Atherapeutically effective amount of a therapeutic compound, i.e., atherapeutic humanized or chimeric antibody, or pharmaceuticalcomposition according to the invention, may decrease tumor size, orotherwise ameliorate symptoms in a subject. One of ordinary skill in theart would be able to determine such amounts based on such factors as thesubject's size, the severity of the subject's symptoms, and theparticular composition or route of administration selected.

An exemplary, non-limiting range for a therapeutically effective amountof a humanized or chimeric antibody of the invention is about 0.001-30mg/kg, such as about 0.001-20 mg/kg, such as about 0.001-10 mg/kg, suchas about 0.001-5 mg/kg, for example about 0.001-2 mg/kg, such as about0.001-1 mg/kg, for instance about 0.001, about 0.01, about 0.1, about 1,about 5, about 8, about 10, about 12, about 15, or about 18 mg/kg.

Dosage regimens in the above methods of treatment and uses are adjustedto provide the optimum desired response (e.g., a therapeutic response).For example, a single bolus may be administered, several divided dosesmay be administered over time or the dose may be proportionally reducedor increased as indicated by the exigencies of the therapeuticsituation.

In one embodiment, the efficacy of the treatment is monitored during thetherapy, e.g., at predefined points in time.

If desired, an effective daily dose of a pharmaceutical composition maybe administered as two, three, four, five, six or more sub-dosesadministered separately at appropriate intervals throughout the day,optionally, in unit dosage forms. In another embodiment, the humanizedor chimeric antibody, or pharmaceutical composition is administered byslow continuous infusion over a long period, such as more than 24 hours,in order to minimize any unwanted side effects.

While it is possible for a humanized or chimeric antibody of the presentinvention to be administered alone, it is preferable to administer thehumanized or chimeric antibody with a pharmaceutically acceptablecarrier as a pharmaceutical composition as described above.

An effective dose of a humanized or chimeric antibody of the inventionmay also be administered using a weekly, biweekly or triweekly dosingperiod. The dosing period may be restricted to, e.g., 8 weeks, 12 weeksor until clinical progression has been established. Alternatively, aneffective dose of a humanized or chimeric antibody of the invention maybe administered every second, third or fourth week. Preferredadministration is 5-25 mg/kg every 1-3 weeks.

In one embodiment, the humanized or chimeric antibody may beadministered by infusion in a weekly dosage of calculated by mg/m². Suchdosages can, for example, be based on the mg/kg dosage. Suchadministration may be repeated, e.g., 1 to 8 times, such as 3 to 5times. The administration may be performed by continuous infusion over aperiod of from 2 to 24 hours, such as of from 2 to 12 hours. In oneembodiment, the humanized or chimeric antibody may be administered byslow continuous infusion over a long period, such as more than 24 hours,in order to reduce toxic side effects.

In one embodiment, the humanized or chimeric antibody may beadministered in a weekly dosage of calculated as a fixed dose for up to8 times, such as from 4 to 6 times when given once a week. Such regimenmay be repeated one or more times as necessary, for example, after 6months or 12 months. Such fixed dosages can, for example, be based onthe mg/kg dosages provided above, with a body weight estimate of 70 kg.The dosage may be determined or adjusted by measuring the amount ofhumanized or chimeric antibody of the present invention in the bloodupon administration by for instance taking out a biological sample andusing anti-idiotypic antibodies which target the binding region of thehumanized or chimeric antibodies of the present invention.

In one embodiment, the humanized or chimeric antibody may beadministered by maintenance therapy, such as, e.g., once a week for aperiod of 6 months or more.

A humanized or chimeric antibody may also be administeredprophylactically in order to reduce the risk of developing cancer, delaythe onset of the occurrence of an event in cancer progression, and/orreduce the risk of recurrence when a cancer is in remission.

Parenteral compositions may be formulated in dosage unit form for easeof administration and uniformity of dosage. Dosage unit form as usedherein refers to physically discrete units suited as unitary dosages forthe subjects to be treated; each unit contains a predetermined quantityof active compound calculated to produce the desired therapeutic effectin association with the required pharmaceutical carrier. Thespecification for the dosage unit forms of the present invention aredictated by and directly dependent on (a) the unique characteristics ofthe active compound and the particular therapeutic effect to beachieved, and (b) the limitations inherent in the art of compoundingsuch an active compound for the treatment of sensitivity in individuals.

Pharmaceutical compositions comprising a humanized or chimeric antibodyaccording to the present invention will be formulated as solutions,suspensions, or other dosage forms for topical ophthalmic administrationin a pharmaceutically acceptable carrier, adjuvant, or vehicle fortreatment of ocular condition such as diabetic retinopathy andage-related macular degeneration. Preferred embodiments include aqueoussolutions due to their ease of formulation, as well as a subject'sability to easily administer these compositions to the eye via one totwo drops of the solution in the affected eyes. The compositions,however, may also be suspensions, viscous or semi-viscous gels, or othertypes of solid or semi-solid compositions. Additional ingredients thatmay be included in the formulation include carriers, tonicity enhancers,preservatives, solubilizers, non-toxic excipients, demulcents,sequestering agents, pH adjusting agents, co-solvents, and viscositybinding agents.

A humanized or chimeric antibody may also be administeredprophylactically in order to reduce the risk of developing ahyperproliferative condition (e.g., lung fibrosis, keloids, interstitiallung disease, and lung cancer), delay the onset of the occurrence of anevent in cancer progression, and/or reduce the risk of recurrence when acancer is in remission. This may be especially useful in patientswherein it is difficult to locate a tumor that is known to be presentdue to other biological factors.

F. Diagnostic Applications

The humanized or chimeric antibody of the invention may also be used fordiagnostic purposes, using a composition comprising a humanized orchimeric antibody as described herein. Accordingly, the inventionprovides diagnostic methods and compositions using the humanized orchimeric antibodies described herein. Such methods and compositions canbe used for purely diagnostic purposes, such as detecting or identifyinga disease, as well as for monitoring of the progress of therapeutictreatments, monitoring disease progression, assessing status aftertreatment, monitoring for recurrence of disease, evaluating risk ofdeveloping a disease, and the like.

In one aspect, the humanized or chimeric antibody of the presentinvention is used ex vivo, such as in diagnosing a disease in whichcells expressing a specific target of interest and to which thehumanized or chimeric antibody binds, are indicative of disease orinvolved in the pathogenesis, by detecting levels of the target orlevels of cells which express the target of interest on their cellsurface in a sample taken from a patient. This may be achieved, forexample, by contacting the sample to be tested, optionally along with acontrol sample, with the humanized or chimeric antibody according to theinvention under conditions that allow for binding of the antibody to thetarget. Complex formation can then be detected (e.g., using an ELISA).When using a control sample along with the test sample, the level ofhumanized or chimeric antibody or antibody-target complex is analyzed inboth samples and a statistically significant higher level of humanizedor chimeric antibody or antibody-target complex in the test sampleindicates a higher level of the target in the test sample compared withthe control sample.

Examples of conventional immunoassays in which humanized or chimericantibodies of the present invention can be used include, withoutlimitation, ELISA, RIA, FACS assays, plasmon resonance assays,chromatographic assays, tissue immunohistochemistry, western blot,and/or immunoprecipitation, immunofluorescent assay methods includingmicroarrays.

Accordingly, in one embodiment, the present invention relates to amethod of diagnosing a disease characterized by involvement oraccumulation of HDGF-expressing cells, comprising administering anantibody, bispecific antibody, composition or pharmaceutical compositionaccording to any aspect or embodiment herein described, to a subject,optionally wherein the antibody is labeled with a detectable label.

In one embodiment, the invention relates to a method for detecting thepresence of a target, or a cell expressing the target, in a samplecomprising: contacting the sample with a humanized or chimeric antibodyof the invention under conditions that allow for binding of thehumanized or chimeric antibody to the target in the sample; andanalyzing whether a complex has been formed. Typically, the sample is abiological sample.

In one embodiment, the sample is a tissue sample known or suspected ofcontaining a specific target and/or cells expressing the target, anon-tissue sample or fluid with or without cells. For example, in situdetection of the target expression may be accomplished by removing ahistological specimen from a patient, and providing the humanized orchimeric antibody of the present invention to such a specimen. Thehumanized or chimeric antibody may be provided by applying or byoverlaying the humanized or chimeric antibody to the specimen, which isthen detected using suitable means. It is then possible to determine notonly the presence of the target or target-expressing cells, but also thedistribution of the target or target-expressing cells in the examinedtissue (e.g., in the context of assessing the spread of cancer cells).Using the present invention, those of ordinary skill will readilyperceive that any of a wide variety of histological methods (such asstaining procedures) may be modified in order to achieve such in situdetection.

In the above assays, the humanized or chimeric antibody can be labeledwith a detectable substance to allow bound antibody to be detected.Alternatively, bound (primary) specific humanized or chimeric antibodymay be detected by an antibody which is labeled with a detectablesubstance and which binds to the primary specific humanized or chimericantibody. Furthermore, in the above assays, a diagnostic compositioncomprising an antibody or bispecific antibody according to any aspect orembodiments herein described may be used. Thus, in one aspect, thepresent invention relates to a diagnostic composition comprising anantibody or bispecific antibody according to any aspect or embodimentherein described.

Suitable labels for the target-specific humanized or chimeric antibody,secondary antibody and/or target standard used in in vitro diagnostictechniques include, without limitation, various enzymes, prostheticgroups, fluorescent materials, luminescent materials, and radioactivematerials. Examples of suitable enzymes include horseradish peroxidase,alkaline phosphatase, .beta.-galactosidase, and acetylcholinesterase;examples of suitable prosthetic group complexes includestreptavidin/biotin and avidin/biotin; examples of suitable fluorescentmaterials include umbelliferone, fluorescein, fluoresceinisothiocyanate, rhodamine, dichlorotriazinylamine fluorescein, dan sylchloride and phycoerythrin; an example of a luminescent materialincludes luminol; and examples of suitable radioactive material include¹²⁵I, ¹³¹I, ³⁵S, and ³H.

G. Kits

The invention also provides kits (or articles of manufacture) for use inthe treatment of the disorders described above. Kits of the inventioninclude one or more containers comprising a purified engineeredpolypeptide conjugate and instructions for using the conjugate fortreating a disease. For example, the instructions comprise a descriptionof administration of the engineered polypeptide conjugate to treat adisease, such as cancer (e.g., colon, esophageal, gastric, head andneck, lung, ovarian, or pancreatic cancer). The kit may further comprisea description of selecting an individual suitable for treatment based onidentifying whether that individual has the disease and the stage of thedisease.

The instructions relating to the use of the engineered polypeptideconjugate generally include information as to dosage, dosing schedule,and route of administration for the intended treatment. The containersmay be unit doses, bulk packages (e.g., multi-dose packages) or subunitdoses. Instructions supplied in the kits of the invention are typicallywritten instructions on a label or package insert (e.g., a paper sheetincluded in the kit), but machine-readable instructions (e.g.,instructions carried on a magnetic or optical storage disk) are alsoacceptable.

The kits of this invention are in suitable packaging. Suitable packagingincludes, but is not limited to, vials, bottles, jars, flexiblepackaging (e.g., sealed Mylar or plastic bags), and the like. Alsocontemplated are packages for use in combination with a specific device,such as an inhaler, nasal administration device (e.g., an atomizer) oran infusion device such as a minipump. A kit may have a sterile accessport (for example the container may be an intravenous solution bag or avial having a stopper pierceable by a hypodermic injection needle). Thecontainer may also have a sterile access port (for example the containermay be an intravenous solution bag or a vial having a stopper pierceableby a hypodermic injection needle). At least one active agent in thecomposition is an engineered polypeptide as described herein. Thecontainer may further comprise a second pharmaceutically active agent.

Kits may optionally provide additional components such as buffers andinterpretive information. Normally, the kit comprises a container and alabel or package insert(s) on or associated with the container.

Thus, in one aspect, the present invention provides a kit for detectingthe presence of a growth factor (HDGF, VEGF, and TGFβ) in a samplecomprising the steps of;

a) contacting the sample with an antibody or bispecific antibodyaccording to the invention, under conditions that allow for formation ofa complex between the antibody or bifunctional antibody and the targetof interest; and b) analyzing whether a complex has been formed. In someembodiments, anti-human or anti mouse IgG antibodies may be used todetect binding. It is possible to also use the antibody in certain typesof array or micro-fluidic device which can use electron-optical methodto detect the binding. An example of this is surface plasmon resonanceor other methods based on surface interaction and optical or surfaceatomic force scanning.

In one embodiment, the present invention provides a kit for diagnosis ofcancer comprising a container comprising a target-specific humanized orchimeric antibody, and one or more reagents for detecting binding of thetarget-specific humanized or chimeric antibody to the target. Reagentsmay include, for example, fluorescent tags, enzymatic tags, or otherdetectable tags. The reagents may also include secondary or tertiaryantibodies or reagents for enzymatic reactions, wherein the enzymaticreactions produce a product that may be visualized. In one embodiment,the present invention provides a diagnostic kit comprising one or moretarget-specific humanized or chimeric antibodies of the presentinvention in labeled or unlabeled form in suitable container(s),reagents for the incubations for an indirect assay, and substrates orderivatizing agents for detection in such an assay, depending on thenature of the label. Control reagent(s) and instructions for use alsomay be included.

Diagnostic kits may also be supplied for use with a target-specifichumanized or chimeric antibody, such as a labeled target-specificantibody, for the detection of the presence of the target in a tissuesample or host. In such diagnostic kits, as well as in kits fortherapeutic uses described elsewhere herein, a target-specific humanizedor chimeric antibody typically may be provided in a lyophilized form ina container, either alone or in conjunction with additional antibodiesspecific for a target cell or peptide. Typically, a pharmaceuticallyacceptable carrier (e.g., an inert diluent) and/or components thereof,such as a Tris, phosphate, or carbonate buffer, stabilizers,preservatives, biocides, inert proteins, e.g., serum albumin, or thelike, also are included (typically in a separate container for mixing)and additional reagents (also typically in separate container(s)). Incertain kits, a secondary antibody capable of binding to thetarget-specific humanized or chimeric antibody, which typically ispresent in a separate container, is also included. The second antibodyis typically conjugated to a label and formulated in a manner similar tothe target-specific humanized or chimeric antibody of the presentinvention. Using the methods described above and elsewhere herein,target-specific humanized or chimeric antibodies may be used to definesubsets of cancer/tumor cells and characterize such cells and relatedtumor tissues.

H. Therapeutic Agents

Many therapeutic agents are available that can be conjugated to anantibody or used in conjunction with antibody therapies describedherein. In embodiments, therapeutic agents, including, but not limitedto, cytotoxic agents, anti-angiogenic agents, pro-apoptotic agents,antibiotics, hormones, hormone antagonists, chemokines, drugs, prodrugs,toxins, enzymes or other agents may be used as adjunct therapies whenusing the antibody/peptide ligand complexes described herein. Drugsuseful in the invention may, for example, possess a pharmaceuticalproperty selected from the group consisting of antimitotic, antikinase,alkylating, antimetabolite, antibiotic, alkaloid, anti-angiogenic,pro-apoptotic agents and combinations thereof. Other examples includepaclitaxel, docetaxel, doxorubicin, cis platinum, and ricin.

In the following description, for the purposes of explanation, numerousspecific details are set forth in order to provide a thoroughunderstanding of the present invention. It will be apparent, however, toone skilled in the art that the present invention may be practicedwithout these specific details. In order that the invention may bereadily understood and put into practical effect, particular preferredembodiments will now be described by way of the following non-limitingexamples.

6. Examples

The invention is illustrated herein by the experiments described by thefollowing examples, which should not be construed as limiting. Thecontents of all references, pending patent applications and publishedpatents, cited throughout this application are hereby expresslyincorporated by reference. Those skilled in the art will understand thatthis invention may be embodied in many different forms and should not beconstrued as limited to the embodiments set forth herein. Rather, theseembodiments are provided so that this disclosure will fully convey theinvention to those skilled in the art. Many modifications and otherembodiments of the invention will come to mind in one skilled in the artto which this invention pertains having the benefit of the teachingspresented in the foregoing description. Although specific terms areemployed, they are used as in the art unless otherwise indicated.

Example 1. Production of Anti-HDGF Antibody Secreting Hybridoma ClonesC1, C4, H3, and L5-9

To explore a bi-functional antibody-based therapeutic strategy, a panelof anti-HDGF antibodies (HDGF-C1, -C4, -H3, and L5-9) as previouslydescribed in Table 1 were created to bind native HDGF. In someembodiments, the antibodies are IgG1 and recognize HDGF and canrecognized modified forms or variants, or fragments of HDGF. The cDNAfragment that encodes HDGF was PCR amplified and cloned into pGEX-4-T1vector (GE Health Care, Piscataway, N.J.). The resulting plasmid,pGST-HDGF, was used to generate GST-HDGF fusion protein in E. colistrain BL21 (DE) 3. The recombinant protein was purified using GSTaffinity chromatography. Balb/c mice were then immunized with the fusionprotein and boosted twice. Three days after the last boost, mice weresacrificed and spleenocytes were fused with P3X63Ag8.653 cells followedby culturing in selecting medium. Anti-HDGF antibody secreting hybridomaclones were identified and verified. For large scale antibodyproduction, hybridoma cells were cultured in RPMI 1640 supplemented withNutridoma CS (Roche Applied Science, Indianapolis, Ind.). The antibodieswere purified using protein G-agarose (GE Health Care) affinitychromatograph. Purified antibody was then dialyzed and sterile filteredthrough a 0.22 μm filter. Sequence analysis produced the following aminoacid sequences of antibody clones C1, C4, H3, and L5-9 set forth belowin Table 3.

TABLE 3 Amino Acid Sequences of Antibody Clones C1, C4, H3, and L5-9Variable domains of anti-HDGF antibody clones H3, C1, C4, and L52.1 Clone H3 2.1.1 H3HD4MGRLTSSFLLLVVPIYVLSQITLKQSGPGIVQPSQPVRLTCTFSGFSLSTSGI (H3 heavyGVAWIRQPSGKGLEWLATIWWDDDNRYNPSLKSRLAVSKDTSNNQAFL chain)NIITVETADTAIYYCAQIYDYAVGFAYWGQGTLVTVSAAKTTPPSVYPLAPGSLGRAN (SEQ ID NO: 9) 2.1.2 H3LF2MVSTAQFLGLLLLCFQGTRCDIQMIQTTSSLSASLGDRVTISCRASQDISN (H3 lightYLNWYQQKPDGTVKLLIYYTSRLHSGVPSRFSGSGSGTDYSLTISNLEPDD chain)IATYYCQQYGKLWTFGGGTKLEIKRADAAPTVSIFPPSSKLGKGEF (SEQ ID NO: 10)2.2 Clone C1 2.2.1 C1HA5MNLGLSWIFFAVFYQGVHCEVQLVESGGRLVQPKGSLKLSCAASGFTFN (C1 heavyTYAMYWIRQAPGKGLEWVARIRSKSYNYATYYADSVKDRFTISRDDSQS chain)MSYLQMNNLKTADTAMYYCVSEGFWGQGTSVTVSSAKTTPPSVYPLVPGSLGRANSADIHHTG (SEQ ID NO: 11) 2.2.2 C1LG1MKLPVRLLVLMFWIPASSSDVLMTQTPLSLPVSLGDQASISCRSSQSIVHS (C1 light chain)SGNTYLEWYLQKPGQSPKLLIYKVSNRFSGVPDRFSGSGSGTDFTLKISRVEAEDLGVYYCFQGSHVPWTFGGGTKLEIKRADAAPTVSIFPPSSKLGKGE F (SEQ ID NO: 12)2.3 Clone C4 2.3.1 C4HD1MDRLTSSFLLLIVPAYVLSQVTLKESGPGILQPSQTLSLTCSFSGFSLSTSG (C4 heavyMGVGWIRQPSGKGLEWLAHIWWDDVKRFNPDLKSRLTISKDTSSAQVFL chain)KIASVDTADTATYYCTRIEDYDGALDYWGQGTSVTVSSAKTTPPSVYPLAPGSLGRAN (SEQ ID NO: 13) 2.3.2 C4LA1MESQSQVFLSLLLWVSGTCGNIMMTQSPSSLAVSTGEMVTMSCKSSQSV (C4 light chain)LYSSNQKNYLAWFQQTPGQSPKLLIYWASTRESGVPDRFTGSGSGTDFTLTISNVQAADLAVYYCHQYLSSWTFGGGTKLEIKRADAAPTVSIFPPSSKLG KGEF (SEQ ID NO: 14)2.4 clone L5 (also marked as L5-9) 2.4.1 L5HB-1MKWSWVFLFLVATATGVRSQVQLQQPGAELVKPGASVKLSCKASGYTF (L5 heavyTSYWIHWVKQRPGQGLEWIGNINPNSGSTDNNEKFTSKATLTVDTSSSTA chain)YMQLSSLTSEDSAVYYCTTLLGRTGFAYWGQGTLVTVSAAKTTPPSVYPLAPGSLGRAN (SEQ ID NO: 15) 2.4.2 L5LD1MRAPAQILGILLLWFPGIKCDIKMTQSPSSMYASLGERVTITCKASQDINS (L5 light chain)YLSWFQQKPGKSPKTLIYRANRLLDGVPSRFSGSGSGQDYSLTISSLEYEDLGIYYCLQYDEFPLTFGAGTKLELKRADAAPTVSIFPPSSKLGKGEF (SEQ ID NO: 16)

Example 2. Humanized Anti-HDGF H3 Antibody (hH3)

The humanized anti-HDGF H3 (hH3) was created by grafting the complementdeterment region (CDR) of mouse H3 to a human IgG1 framework. Methodsfor making monoclonal mouse H3 antibody are described in Ren, H., etal., “Antibodies targeting hepatoma-derived growth factor as a novelstrategy in treating lung cancer,” Mol Cancer Ther. 2009 May; 8 (5):1105-1112.

Humanization of H3 was performed to generate a humanized H3 (hH3)monoclonal antibody by the CDR grafting method. Usually, rodentantibodies can be immunogenic to human and cause very serious sideeffects including the HAMA (human anti-mouse antibodies) response oranaphylactic shock. With this CDR grafting approach, CDR loops that makeup the antigen-binding site of the mouse Mab are grafted intocorresponding human framework regions. Initially, the variable light andheavy chain sequences of H3 were determined as shown in Table 3. To doso, H3 hybridoma cells were harvested by centrifugation and total RNAwas extracted from cells. Total RNA was used for cDNA synthesis, andV-region genes of H3 were amplified, cloned and sequenced using standardprimer sets.

CDR sequences were grafted into these VL and VH, such that thesynthesized sequences each CDRs in the selected human frameworksequences. To construct humanized H3 IgG1 in a mammalian expressionvector, pLVBHN vectors were used. The following is a brief vector map.The vector was synthesized from several sources (e.g., see FIG. 9).However, it can be expressed from any mammalian expression vectors. Thebackbone of the vector for expression of recombinant antibody ismodified from pTRIPZ (Open biosystems or GE Dharmacon), including LTR,psi, RRE, WPRE; the CMV promoter is from pHTN (Promega). However, anymammalian expression vector can be used to express the recombinantantibody. Transient transfection was used using Expi293 system fromInvitrogen. Sequences are provided below.

2.1 Humanized H3 heavy chain variable region, mature sequence.SEQ ID NO: 17 QITLKESGPTLVKPTQTLTLTCTFSGFSLSTSGIGVAWIRQPPGKALEWLATIWWDDDNRYNPSLKSRLTITKDTSKNQVVLTMTNMDPVDTATYYCAQIYDYAVGFAYWGQGTLVTVSS. 2.2 Humanized H3 light chain variable region,mature sequence. SEQ ID NO: 18DIQMTQSPSSLSASLGDRVTISCRASQDISNYLNWYQQKPGKAPKLLIYYTSRLHSGVPSRFSGSGSGTDYSLTISSLQPEDIATYYCQQYGKLWT FGQGTKLE.2.3 Humanized H3 heavy chain, mature sequence. SEQ ID NO: 19QITLKESGPTLVKPTQTLTLTCTFSGFSLSTSGIGVAWIRQPPGKALEWLATIWWDDDNRYNPSLKSRLTITKDTSKNQVVLTMTNMDPVDTATYYCAQIYDYAVGFAYWGQGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMH EALHNHYTQKSLSLSPGK.2.4 Humanized H3 light chain, mature sequence. SEQ ID NO: 20DIQMTQSPSSLSASLGDRVTISCRASQDISNYLNWYQQKPGKAPKLLIYYTSRLHSGVPSRFSGSGSGTDYSLTISSLQPEDIATYYCQQYGKLWTFGQGTKLEIKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYA CEVTHQGLSSPVTKSFNRGEC.

Example 3: Construction of Chimeric H3 Antibody (cH3)

The chimeric H3 was constructed by fusing the variable domain of mouseanti-HDGF H3 with human IgG1 constant region. Sequences are providedbelow.

TABLE 4 Chimeric H3 sequences with variable domain frommouse and human IgG1 constant region. 3.1 Heavy chain. SEQ ID NO: 21.MVSTAQFLGLLLLCFQGTRCQITLKQSGPGIVQPSQPVRLTCTFSGFSLSTSGIGVAWIRQPSGKGLEWLATIWWDDDNRYNPSLKSRLAVSKDTSNNQAFLNIITVETADTAIYYCAQIYDYAVGFAYWGQGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 3.2 Light chain. SEQ ID NO: 22.MVSTAQFLGLLLLCFQGTRCDIQMTQTTSSLSASLGDRVTISCRASQDISNYLNWYQQKPDGTVKLLIYYTSRLHSGVPSRFSGSGSGTDYSLTISNLEPDDIATYYCQQYGKLWTFGGGTKLEIKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGEC

Example 4: Construction of Chimeric Bifunctional Antibodies H3K and H3T

Method of Generating Anti-HDGF Hybridomas

Balb/c mice were immunized with recombinant HDGF in freund's adjuvant.Splenocytes from immunized animals were fused with P3x63Ag8.653 cellsand screened for HDGF reactivity in the culture supernatant. Positiveclones were identified and anti-HDGF antibody secretion was verified byimmunoblot analysis of cancer cell lysate and purified HDGF.

Determination of the Amino Acid Sequences of Anti-HDGF Antibody

RNA from anti-HDGF antibody producing hybridoma was extracted, reversetranscribed into cDNA. Primers designed to amplify the Ig variableregion (Larrick, J. W., et al. 1989. Biochem. Biophys. Res. Comm 160,1250. Jones, S. T. and Bendig, M. M. 1991. Biotechnology 9, 88.) wereused to amplify the cDNA encoding the mouse Ig heavy and light chain.The amplified product were cloned and sequenced. The cDNA sequence thatencoded the murine Ig heavy chain and light chain, and the CDRs wereidentified as described in http://www.bioinf.org.uk/abs/.

Generation of the Chimeric Antibody

The DNA fragment s that encoded the murine antibody variable domain (VHand VL) were grafted to the N-terminal of the constant region of theirhuman IgG1 count part by standard molecular biology techniques, andcloned into a mammalian expression vector respectively. To produce thechimeric antibody, plasmids encoding for the heavy and light chain wereco-transfected into Expi293 cells (Invitrogen) at a ratio of 1:2. Theantibody was purified from the conditioned media by protein G affinitychromatograph.

Humanization of the Murine Anti-HDGF Antibody H3

The cDNA sequence that encoded the murine Ig heavy chain and lightchain, and the CDRs were identified as described by Martin A.C.R.(http://www.bioinf.org.uk/abs/). The humanized anti-HDGF Vh sequenceswere then created by replacing the CDRs in human Ig G1 Vh with thecorresponding murine CDRs. The DNA sequence that encode the humanizedsequence is then synthesized and grafted on the N-termini of the humanIgG1 heavy chain constant region, cloned into a mammalian expressionvector to generate a humanized Ig heavy chain expression construct. Thehumanized VL expression construct was created similarly. To produce thehumanized anti-HDGF antibody, the plasmids that encode for the heavy andlight chain was used to transfect Expi293 cell at a ratio of 1:2. Theantibody was purified from the conditioned media by protein G affinitychromatograph.

Construction of Fc Fused Growth Factor Binding Domain (GF Trapper)

Construction of Fc-VEGF trapper: DNA fragment corresponding to domain 2and 3 (D2 and D3) of human VEGF receptor 2 (kinase insert domainreceptor) amino acid residue 122 to residue 327 (based on NP_002253) wasamplified from HEK 293 cDNA. The amplified sequence was fused to theC-terminus of the human IgG1 heavy chain via a poly-GlySer linker,(GlyGlyGlyGlySer)₂ (SEQ ID NO:23), or (G4S)2. The full-length anti-HDGFantibody heavy chain-VEGF trapper sequence was cloned into a mammalianexpression plasmid.

Construction of Fc-TGFB trapper: DNA fragment corresponding to humanTGFBR2 extracellular domain amino acid residue 27 to residue 184 (basedon NP_001020018) was amplified from human lung cDNA. The amplifiedsequence was fused to the C-terminus of the human IgG1 heavy chain via apoly-GlySer linker, (GlyGlyGlyGlySer)₂ (SEQ ID NO:23), or (G4S)2. Thefull-length anti-HDGF antibody heavy chain-TGFB trapper sequence wascloned into a mammalian expression plasmid.

Production of Recombinant Antibody (Chimeric, and Trapper)

To produce the recombinant anti-HDGF antibody, plasmids encoding for theheavy and light chain were co-transfected into Expi293 cells(Invitrogen) at a ratio of 1:2. The antibody was purified from theconditioned media by protein G affinity chromatograph.

Example 5. Treatment of MDA-2131-8 PDX Cells with H3K ChimericBifunctional Antibody

Human patient derived tumor xenograph (PDX) model 2131-8, a poorlydifferentiated adenocarcinoma of the lung, was implanted on the flank ofathymic nude mice. As shown in FIG. 3, established tumor (150-400 mm³,10 tumors per group) were treated with chemotherapy or combinedchemo-plus antibody regimen. Arm A: PBS; Arm B: Gemcitabine, 1.2 mg/kg;Arm C: Gemcitabine 1.2 mg/kg plus anti-HDGF H3 at 12.5 mg/kg; Arm D:Gemcitabine 1.2 mg/kg plus anti-HDGF H3/VEGF trapper (H3K) at 12.5mg/kg. The drugs were given intraperitonally every 3 days till tumorregression or sacrifice due to excess tumor burden. As shown in FIG. 3,the H3K bifunctional antibody induces extended tumor remission.Treatment was terminated after complete tumor remission in animalsreceiving Gemzar plus antibody. Therapy relapse were monitored. Arm C:Gemzar plus anti-HDFG H3 treated; Arm D: Gemzar plus anti-HDGF/VEGFtrapper (H3K) treated. FIG. 4 shown extended remission in anti-HDGF pluschemo treatment, and even fewer relapse in h3k plus chemo group.

Example 6. Treatment of Bleomycin Induced Lung Fibrosis

FIG. 5 illustrates results for mouse survival after bleomycin (36ug/animal) was given intratracheally to C57/B6 mice (5-6 weeks old, 7per group) under anesthesia. Antibodies were given twenty-four hourslater intraperitonally in the following treatment groups: 1) mouseanti-HDGF H3 plus anti-HDGF C1 125 ug each (H3+C1); 2) anti-HDGF H3 250ug plus Avastin 100 μg (H3+A); 3) PBS. The treatments were given every 3days thereafter for a total 6 doses. Animals were monitored daily. Forthe data provided in FIG. 6, mice (5-6 weeks old, 7 per group) wereprimed with antibody intraperitoneally according to the followingtreatment groups: 1) anti-HDGF H3 plus anti-HDGF C1 125 ug each (H3+C1);2) chimeric anti-HDGF H3/VEGF trapper plus anti-HDGF C1, 125 ug each(H3K+C1); 3) chimeric anti-HDGF H3/TGFB trapper plus anti-HDGF C1, 125ug each; 4) PBS control group (PBS). Bleomycin (36 ug/animal) was givenintratracheally 24-hours later under anesthesia. Antibodies were againgiven on day 3 (24-hr post-bleomycin instillation), and every three daysthereafter for a total of 7 doses (including priming) Animals weremonitored daily. These data indicate anti-HDGF antibody, give prior orpost bleomycin instilment delayed the onset and reduced the mortality ofanimals due to lung fibrosis. FIG. 7 shows high-level, sustained HDGFexpression after Bleomycin treatment in mouse lung. FIG. 8 shownhistological changes in bleomycin treated animals Hyper-proliferation offibroblast in mouse lung after bleomycin treatment was seen in untreatedor sham (PBS) treated animals (FIG. 8B and FIG. 8C), whereas anti-HDGFtreatment reduce the severity of lung fibrosis.

Example 7. Human NSCLC PDX Tumor MDA274 Response to Anticancer Therapies

Nude mice carrying human NSCLC PDX tumor MDA274 were subjected toanticancer therapies. Using the methods described in Example 5, above, asecond different human patient derived tumor xenograph (PDX) model, alsoa poorly differentiated adenocarcinoma of the lung, was implanted on theflank of athymic nude mice. Drugs were administered every three days.

As shown in FIG. 11, established tumor (10 tumors per group) weretreated with chemotherapy or with combined chemotherapy plus antibodyregimen. Tumor volumes were measured every three days. FIG. 11A shows asummary of average tumor volumes after five treatment regimens. Diamondsindicate negative control (PBS) treatment; squares indicate chemotherapy(Gemcitabine, 50 mg/kg, and Pemetrexed, 30 mg/kg); triangles indicatechemotherapy as above plus anti-VEGF antibody, 12.5 mg/kg; X indicateschemotherapy as above plus anti-HDGF antibody, 12.5 mg/kg; asteriskindicates chemotherapy as above plus H3K (anti-HDGF/anti-VEGFbifunctional antibody), 12.5 mg/kg.

FIG. 11B and FIG. 11C show the tumor volumes of individual mice withtreatment consisting of chemotherapy as above plus anti-VEGF antibody(FIG. 11B) and chemotherapy as above plus H3K anti-HDGF/anti-VEGFbifunctional antibody. Progression-free survival was routinely observedin the chemotherapy (Gemcitabine/Pemetrexed) plus H3K group (see FIG.11C).

Example 8. Immunohistochemical Staining

Mice bearing MDA 2131-8 (PDX) tumors were euthanized at 30% and 70%tumor volume reduction and the tumors dissected (about 500 mm³). Thus,tumor tissues at 30% and 70% volume reduction were collected.

The tissues were prepared as follows. The tissues were fixed in 4%formaldehyde-PBS, and embedded in paraffin. Four-micron (4 μm) sectionsof the embedded tissue were cut, mounted on Superfrost® plus microscopeslides. The slides were baked at 55° C., and deparaffined in xylene,followed by rehydration in graded alcohol solutions. The slides thenwere treated in 50 mM Tris-HCl, pH 8.5 for 30 minutes at 100° C. toretrieve antigen, quenched in 3% hydrogen peroxide and blocked in 1%goat serum. Primary antibody at the manufacture recommended dilution(1:100 to 1:1000) was added and incubated with the tissue section at 4°C. overnight. The following day, the sections were washed with PBS, thendeveloped with VECTORSTAIN ABC® HRP kit or Vector MOM Elite® HRP kit perthe manufacture's standard protocol, using diaminobenzidine (DAB) as thechromogenic agent. The developed sections were counterstained withhematoxylin, dehydrated in graded alcohol and xylene, and mounted inPermount® mounting medium. Results are presented in FIG. 12, FIG. 13,and FIG. 14 at magnification 20×.

For FIG. 12, MDA 2131-8 tissue was stained with anti-SOX2 antibody fromCell Signaling Technology® CST3579. FIG. 12A: treatment naïve tumor;FIG. 12B: Gemcitabine plus anti-VEGF treatment at 30% tumor volumereduction; FIG. 12C: Gemcitabine plus H3K bifunctional antibodytreatment at 30% tumor volume reduction. These results show significantreduction of SOX2-positive tumor cells for samples treated with H3Kcompared to anti-VEGF treatment. SOX2 is a stem cell factor essentialfor maintaining cell renewal of undifferentiated embryonic stem cells.It is re-expressed in some cancer cells, and is correlated with moreaggressive tumor phenotypes and drug resistance.

For FIG. 13, MDA 2131-8 tissue was stained with anti-CD34 antibody fromAbcam® ab81289. FIG. 13A: treatment naïve tumor; FIG. 13B: Gemcitabineplus anti-VEGF treatment at 70% tumor volume reduction; FIG. 13C:Gemcitabine plus H3K bifunctional antibody treatment at 70% tumor volumereduction. CD34 is a marker of hematopoietic and mesenchymal stem cells,as well as endothelial progenitor cells. These results therefore showthat in tumor treated with anti-VEGF, a significant amount ofCD34-positive vasculature remains, whereas in H3K-treated tumor, nointact CD34-staining vasculature was found.

For FIG. 14, MDA 2131-8 tissue was stained with anti-CD31 antibody fromInvitrogen® 170700. FIG. 14A: treatment naïve tumor; FIG. 14B:Gemcitabine plus anti-VEGF treatment at 70% tumor volume reduction; FIG.14C: Gemcitabine plus H3K bifunctional antibody treatment at 70% tumorvolume reduction. CD31 is a marker of endothelial cells. These resultstherefore show that in tumor treated with anti-VEGF, a significantamount of CD31-positive vasculature remains, whereas in H3K-treatedtumor, no intact CD31-staining vasculature was found.

REFERENCES

All references cited herein are hereby incorporated by reference intheir entirety.

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What is claimed is:
 1. A bifunctional HDGF-VEGF trapper antibody-basedtargeting protein having two heavy chains and two light chains where theheavy chain comprises SEQ ID NO: 4 and the light chain comprises SEQ IDNO:
 18. 2. The bifunctional HDGF-VEGF trapper antibody-based targetingprotein of claim 1, wherein the antibody is linked to a reportermolecule or an effector molecule.
 3. The bifunctional HDGF-VEGF trapperantibody-based targeting protein claim 2, wherein the reporter moleculeis selected from the group consisting of an enzyme, a radiolabel, ahapten, a fluorescent label, a phosphorescent molecule, achemiluminescent molecule, a chromophore, a luminescent molecule, aphotoaffinity molecule, a ligand, a colored particle and biotin.
 4. Thebifunctional HDGF-VEGF trapper antibody-based targeting protein of claim2, wherein the effector molecule is selected from the group consistingof a toxin, an apoptotic molecule, an antitumor agent, a therapeuticenzyme and a cytokine.
 5. The bifunctional HDGF-VEGF trapperantibody-based targeting protein of claim 4, wherein the antitumor agentis selected from the group consisting of gemcitabine, pemetrexed,cisplatin, docetaxel, vinorelbine, doxorubicin, 6-fluorouracil,erlotinib, gefitinib, and crizotinib.
 6. A pharmaceutical compositioncomprising the bifunctional HDGF-VEGF trapper antibody-based targetingprotein of claim 1 and a pharmaceutically acceptable carrier.
 7. Thepharmaceutical composition of claim 6 which further comprises a cancerchemotherapeutic drug.
 8. The pharmaceutical composition of claim 7,wherein the cancer chemotherapeutic drug is gemcitabine.
 9. Thepharmaceutical composition of claim 6, which is formulated forparenteral, intravenous, local, or topical administration.